Node.js v16.20.0 文档

确定加密支持是否不可用#

¥Determining if crypto support is unavailable

可以在不支持 node:crypto 模块的情况下构建 Node.js。在这种情况下，尝试 import node:http2 或调用 require('node:http2') 将导致抛出错误。

¥It is possible for Node.js to be built without including support for the node:crypto module. In such cases, attempting to import from node:http2 or calling require('node:http2') will result in an error being thrown.

使用 CommonJS 时，可以使用 try/catch 捕获抛出的错误：

¥When using CommonJS, the error thrown can be caught using try/catch:

let http2;
try {
  http2 = require('node:http2');
} catch (err) {
  console.log('http2 support is disabled!');
} 拷贝

当使用词法 ESM import 关键字时，只有在尝试加载模块（例如，使用预加载模块）之前注册了 process.on('uncaughtException') 的处理程序时，才能捕获错误。

¥When using the lexical ESM import keyword, the error can only be caught if a handler for process.on('uncaughtException') is registered before any attempt to load the module is made (using, for instance, a preload module).

使用 ESM 时，如果有可能在未启用加密支持的 Node.js 版本上运行代码，则考虑使用 import() 函数而不是 import 关键字：

¥When using ESM, if there is a chance that the code may be run on a build of Node.js where crypto support is not enabled, consider using the import() function instead of the lexical import keyword:

let http2;
try {
  http2 = await import('node:http2');
} catch (err) {
  console.log('http2 support is disabled!');
} 拷贝

核心接口#

¥Core API

核心 API 提供了低层的接口，专门围绕支持 HTTP/2 协议功能而设计。它不是专门为与现有的 HTTP/1 模块 API 兼容而设计的。但是，兼容性接口 是。

¥The Core API provides a low-level interface designed specifically around support for HTTP/2 protocol features. It is specifically not designed for compatibility with the existing HTTP/1 module API. However, the Compatibility API is.

与 http API 相比，http2 核心 API 在客户端和服务器之间更加对称。例如，大多数事件，如 'error'、'connect' 和 'stream'，可以由客户端代码或服务器端代码触发。

¥The http2 Core API is much more symmetric between client and server than the http API. For instance, most events, like 'error', 'connect' and 'stream', can be emitted either by client-side code or server-side code.

服务器端示例#

¥Server-side example

以下说明了使用核心 API 的简单 HTTP/2 服务器。由于没有已知的浏览器支持 未加密的 HTTP/2，因此在与浏览器客户端通信时必须使用 http2.createSecureServer()。

¥The following illustrates a simple HTTP/2 server using the Core API. Since there are no browsers known that support unencrypted HTTP/2, the use of http2.createSecureServer() is necessary when communicating with browser clients.

const http2 = require('node:http2');
const fs = require('node:fs');

const server = http2.createSecureServer({
  key: fs.readFileSync('localhost-privkey.pem'),
  cert: fs.readFileSync('localhost-cert.pem')
});
server.on('error', (err) => console.error(err));

server.on('stream', (stream, headers) => {
  // stream is a Duplex
  stream.respond({
    'content-type': 'text/html; charset=utf-8',
    ':status': 200
  });
  stream.end('<h1>Hello World</h1>');
});

server.listen(8443); 拷贝

要为此示例生成证书和密钥，则运行：

¥To generate the certificate and key for this example, run:

openssl req -x509 -newkey rsa:2048 -nodes -sha256 -subj '/CN=localhost' \
  -keyout localhost-privkey.pem -out localhost-cert.pem 拷贝

客户端示例#

¥Client-side example

以下说明了 HTTP/2 客户端：

¥The following illustrates an HTTP/2 client:

const http2 = require('node:http2');
const fs = require('node:fs');
const client = http2.connect('https://localhost:8443', {
  ca: fs.readFileSync('localhost-cert.pem')
});
client.on('error', (err) => console.error(err));

const req = client.request({ ':path': '/' });

req.on('response', (headers, flags) => {
  for (const name in headers) {
    console.log(`${name}: ${headers[name]}`);
  }
});

req.setEncoding('utf8');
let data = '';
req.on('data', (chunk) => { data += chunk; });
req.on('end', () => {
  console.log(`\n${data}`);
  client.close();
});
req.end(); 拷贝

类：Http2Session#

¥Class: Http2Session

• 继承：<EventEmitter>

  ¥Extends: <EventEmitter>

http2.Http2Session 类的实例表示 HTTP/2 客户端和服务器之间的活动通信会话。此类的实例不打算由用户代码直接构造。

¥Instances of the http2.Http2Session class represent an active communications session between an HTTP/2 client and server. Instances of this class are not intended to be constructed directly by user code.

每个 Http2Session 实例将表现出略有不同的行为，具体取决于它是作为服务器还是客户端运行。http2session.type 属性可用于确定 Http2Session 的运行模式。在服务器端，用户代码很少有机会直接使用 Http2Session 对象，大多数操作通常是通过与 Http2Server 或 Http2Stream 对象的交互来执行的。

¥Each Http2Session instance will exhibit slightly different behaviors depending on whether it is operating as a server or a client. The http2session.type property can be used to determine the mode in which an Http2Session is operating. On the server side, user code should rarely have occasion to work with the Http2Session object directly, with most actions typically taken through interactions with either the Http2Server or Http2Stream objects.

用户代码不会直接创建 Http2Session 实例。服务器端 Http2Session 实例是在接收到新的 HTTP/2 连接时由 Http2Server 实例创建的。客户端 Http2Session 实例是使用 http2.connect() 方法创建的。

¥User code will not create Http2Session instances directly. Server-side Http2Session instances are created by the Http2Server instance when a new HTTP/2 connection is received. Client-side Http2Session instances are created using the http2.connect() method.

Http2Session 和套接字#

¥Http2Session and sockets

每个 Http2Session 实例在创建时都与 net.Socket 或 tls.TLSSocket 关联。当 Socket 或 Http2Session 被摧毁时，两者都会被摧毁。

¥Every Http2Session instance is associated with exactly one net.Socket or tls.TLSSocket when it is created. When either the Socket or the Http2Session are destroyed, both will be destroyed.

由于 HTTP/2 协议规定的特定序列化和处理要求，不建议用户代码从绑定到 Http2Session 的 Socket 实例读取数据或向其写入数据。这样做会使 HTTP/2 会话进入不确定状态，导致会话和套接字变得不可用。

¥Because of the specific serialization and processing requirements imposed by the HTTP/2 protocol, it is not recommended for user code to read data from or write data to a Socket instance bound to a Http2Session. Doing so can put the HTTP/2 session into an indeterminate state causing the session and the socket to become unusable.

一旦将 Socket 绑定到 Http2Session，用户代码应仅依赖于 Http2Session 的 API。

¥Once a Socket has been bound to an Http2Session, user code should rely solely on the API of the Http2Session.

事件：'close'#

¥Event: 'close'

'close' 事件在 Http2Session 被销毁后触发。其监听器不需要任何参数。

¥The 'close' event is emitted once the Http2Session has been destroyed. Its listener does not expect any arguments.

事件：'connect'#

¥Event: 'connect'

• session <Http2Session>

• socket <net.Socket>

一旦 Http2Session 成功连接到远程对等方并且通信可以开始，则会触发 'connect' 事件。

¥The 'connect' event is emitted once the Http2Session has been successfully connected to the remote peer and communication may begin.

用户代码通常不会直接监听此事件。

¥User code will typically not listen for this event directly.

事件：'error'#

¥Event: 'error'

• error <Error>

'error' 事件在处理 Http2Session 期间发生错误时触发。

¥The 'error' event is emitted when an error occurs during the processing of an Http2Session.

事件：'frameError'#

¥Event: 'frameError'

• type <integer> 帧类型。

  ¥type <integer> The frame type.

• code <integer> 错误代码。

  ¥code <integer> The error code.

• id <integer> 流 id（或如果帧不与流相关联，则为 0）。

  ¥id <integer> The stream id (or 0 if the frame isn't associated with a stream).

当尝试在会话上发送帧时发生错误时会触发 'frameError' 事件。如果无法发送的帧与特定的 Http2Stream 相关联，则会尝试在 Http2Stream 上触发 'frameError' 事件。

¥The 'frameError' event is emitted when an error occurs while attempting to send a frame on the session. If the frame that could not be sent is associated with a specific Http2Stream, an attempt to emit a 'frameError' event on the Http2Stream is made.

如果 'frameError' 事件与流相关联，则该流将在 'frameError' 事件之后立即关闭并销毁。如果事件与流无关，则 Http2Session 将在 'frameError' 事件之后立即关闭。

¥If the 'frameError' event is associated with a stream, the stream will be closed and destroyed immediately following the 'frameError' event. If the event is not associated with a stream, the Http2Session will be shut down immediately following the 'frameError' event.

事件：'goaway'#

¥Event: 'goaway'

• errorCode <number> GOAWAY 帧中指定的 HTTP/2 错误代码。

  ¥errorCode <number> The HTTP/2 error code specified in the GOAWAY frame.

• lastStreamID <number> 远程对等方成功处理的最后一个流的 ID（如果未指定 ID，则为 0）。

  ¥lastStreamID <number> The ID of the last stream the remote peer successfully processed (or 0 if no ID is specified).

• opaqueData <Buffer> 如果 GOAWAY 帧中包含其他不透明数据，则将传入包含该数据的 Buffer 实例。

  ¥opaqueData <Buffer> If additional opaque data was included in the GOAWAY frame, a Buffer instance will be passed containing that data.

接收到 GOAWAY 帧时触发 'goaway' 事件。

¥The 'goaway' event is emitted when a GOAWAY frame is received.

'goaway' 事件触发时，Http2Session 实例会自动关闭。

¥The Http2Session instance will be shut down automatically when the 'goaway' event is emitted.

事件：'localSettings'#

¥Event: 'localSettings'

• settings <HTTP/2 Settings Object> 接收到了 SETTINGS 帧的副本。

  ¥settings <HTTP/2 Settings Object> A copy of the SETTINGS frame received.

当接收到确认 SETTINGS 帧时触发 'localSettings' 事件。

¥The 'localSettings' event is emitted when an acknowledgment SETTINGS frame has been received.

当使用 http2session.settings() 提交新的设置时，修改后的设置在 'localSettings' 事件触发后才会生效。

¥When using http2session.settings() to submit new settings, the modified settings do not take effect until the 'localSettings' event is emitted.

session.settings({ enablePush: false });

session.on('localSettings', (settings) => {
  /* Use the new settings */
}); 拷贝

事件：'ping'#

¥Event: 'ping'

• payload <Buffer> PING 帧 8 字节有效载荷

  ¥payload <Buffer> The PING frame 8-byte payload

每当从连接的对等方接收到 PING 帧时，则会触发 'ping' 事件。

¥The 'ping' event is emitted whenever a PING frame is received from the connected peer.

事件：'remoteSettings'#

¥Event: 'remoteSettings'

• settings <HTTP/2 Settings Object> 接收到了 SETTINGS 帧的副本。

  ¥settings <HTTP/2 Settings Object> A copy of the SETTINGS frame received.

当从连接的对等方接收到新的 SETTINGS 帧时，则会触发 'remoteSettings' 事件。

¥The 'remoteSettings' event is emitted when a new SETTINGS frame is received from the connected peer.

session.on('remoteSettings', (settings) => {
  /* Use the new settings */
}); 拷贝

事件：'stream'#

¥Event: 'stream'

• stream <Http2Stream> 对流的引用

  ¥stream <Http2Stream> A reference to the stream

• headers <HTTP/2 Headers Object> 描述标头的对象

  ¥headers <HTTP/2 Headers Object> An object describing the headers

• flags <number> 相关的数字标志

  ¥flags <number> The associated numeric flags

• rawHeaders <Array> 包含原始标头名称后跟它们各自值的数组。

  ¥rawHeaders <Array> An array containing the raw header names followed by their respective values.

创建新的 Http2Stream 时会触发 'stream' 事件。

¥The 'stream' event is emitted when a new Http2Stream is created.

const http2 = require('node:http2');
session.on('stream', (stream, headers, flags) => {
  const method = headers[':method'];
  const path = headers[':path'];
  // ...
  stream.respond({
    ':status': 200,
    'content-type': 'text/plain; charset=utf-8'
  });
  stream.write('hello ');
  stream.end('world');
}); 拷贝

在服务器端，用户代码通常不会直接监听此事件，而是为分别由 http2.createServer() 和 http2.createSecureServer() 返回的 net.Server 或 tls.Server 实例触发的 'stream' 事件注册句柄，如下例所示：

¥On the server side, user code will typically not listen for this event directly, and would instead register a handler for the 'stream' event emitted by the net.Server or tls.Server instances returned by http2.createServer() and http2.createSecureServer(), respectively, as in the example below:

const http2 = require('node:http2');

// Create an unencrypted HTTP/2 server
const server = http2.createServer();

server.on('stream', (stream, headers) => {
  stream.respond({
    'content-type': 'text/html; charset=utf-8',
    ':status': 200
  });
  stream.on('error', (error) => console.error(error));
  stream.end('<h1>Hello World</h1>');
});

server.listen(80); 拷贝

即使 HTTP/2 流和网络套接字不是 1:1 对应关系，网络错误也会销毁每个单独的流，并且必须在流级别进行处理，如上所示。

¥Even though HTTP/2 streams and network sockets are not in a 1:1 correspondence, a network error will destroy each individual stream and must be handled on the stream level, as shown above.

事件：'timeout'#

¥Event: 'timeout'

使用 http2session.setTimeout() 方法为此 Http2Session 设置超时时间后，如果在配置的毫秒数后 Http2Session 上没有活动，则触发 'timeout' 事件。其监听器不需要任何参数。

¥After the http2session.setTimeout() method is used to set the timeout period for this Http2Session, the 'timeout' event is emitted if there is no activity on the Http2Session after the configured number of milliseconds. Its listener does not expect any arguments.

session.setTimeout(2000);
session.on('timeout', () => { /* .. */ }); 拷贝

http2session.alpnProtocol#

• <string> | <undefined>

如果 Http2Session 尚未连接到套接字，则值为 undefined，如果 Http2Session 未连接到 TLSSocket，则值为 h2c，或者将返回已连接的 TLSSocket 自己的 alpnProtocol 属性的值。

¥Value will be undefined if the Http2Session is not yet connected to a socket, h2c if the Http2Session is not connected to a TLSSocket, or will return the value of the connected TLSSocket's own alpnProtocol property.

http2session.close([callback])#

• callback <Function>

正常地关闭 Http2Session，允许任何现有的流自行完成并防止创建新的 Http2Stream 实例。关闭后，如果没有打开的 Http2Stream 实例，则可能会调用 http2session.destroy()。

¥Gracefully closes the Http2Session, allowing any existing streams to complete on their own and preventing new Http2Stream instances from being created. Once closed, http2session.destroy() might be called if there are no open Http2Stream instances.

如果指定，则 callback 函数将注册为 'close' 事件的句柄。

¥If specified, the callback function is registered as a handler for the 'close' event.

http2session.closed#

• <boolean>

如果此 Http2Session 实例已关闭，则为 true，否则为 false。

¥Will be true if this Http2Session instance has been closed, otherwise false.

http2session.connecting#

• <boolean>

如果此 Http2Session 实例仍在连接，则将是 true，在触发 connect 事件和/或调用 http2.connect 回调之前将设置为 false。

¥Will be true if this Http2Session instance is still connecting, will be set to false before emitting connect event and/or calling the http2.connect callback.

http2session.destroy([error][, code])#

• error <Error> 如果 Http2Session 因错误而被销毁，则为 Error 对象。

  ¥error <Error> An Error object if the Http2Session is being destroyed due to an error.

• code <number> 要在最终 GOAWAY 帧中发送的 HTTP/2 错误代码。如果未指定，且 error 未未定义，则默认为 INTERNAL_ERROR，否则默认为 NO_ERROR。

  ¥code <number> The HTTP/2 error code to send in the final GOAWAY frame. If unspecified, and error is not undefined, the default is INTERNAL_ERROR, otherwise defaults to NO_ERROR.

立即终止 Http2Session 和相关联的 net.Socket 或 tls.TLSSocket。

¥Immediately terminates the Http2Session and the associated net.Socket or tls.TLSSocket.

一旦销毁，则 Http2Session 将触发 'close' 事件。如果 error 未定义，则将在 'close' 事件之前立即触发 'error' 事件。

¥Once destroyed, the Http2Session will emit the 'close' event. If error is not undefined, an 'error' event will be emitted immediately before the 'close' event.

如果有任何剩余的与 Http2Session 关联的开放 Http2Streams，则它们也会被销毁。

¥If there are any remaining open Http2Streams associated with the Http2Session, those will also be destroyed.

http2session.destroyed#

• <boolean>

如果此 Http2Session 实例已被销毁且不能再使用，则为 true，否则为 false。

¥Will be true if this Http2Session instance has been destroyed and must no longer be used, otherwise false.

http2session.encrypted#

• <boolean> | <undefined>

如果 Http2Session 会话套接字尚未连接，则值为 undefined，如果 Http2Session 与 TLSSocket 连接，则值为 true，如果 Http2Session 连接到任何其他类型的套接字或流，则值为 false。

¥Value is undefined if the Http2Session session socket has not yet been connected, true if the Http2Session is connected with a TLSSocket, and false if the Http2Session is connected to any other kind of socket or stream.

http2session.goaway([code[, lastStreamID[, opaqueData]]])#

• code <number> HTTP/2 错误代码

  ¥code <number> An HTTP/2 error code

• lastStreamID <number> 最后处理的 Http2Stream 的数字 ID

  ¥lastStreamID <number> The numeric ID of the last processed Http2Stream

• opaqueData <Buffer> | <TypedArray> | <DataView> TypedArray 或 DataView 实例，包含要在 GOAWAY 帧中携带的附加数据。

  ¥opaqueData <Buffer> | <TypedArray> | <DataView> A TypedArray or DataView instance containing additional data to be carried within the GOAWAY frame.

在不关闭 Http2Session 的情况下将 GOAWAY 帧传输到连接的对等方。

¥Transmits a GOAWAY frame to the connected peer without shutting down the Http2Session.

http2session.localSettings#

• <HTTP/2 Settings Object>

描述此 Http2Session 当前本地设置的无原型对象。本地设置是此 Http2Session 实例的本地设置。

¥A prototype-less object describing the current local settings of this Http2Session. The local settings are local to this Http2Session instance.

http2session.originSet#

• <string[]> | <undefined>

如果 Http2Session 连接到 TLSSocket，则 originSet 属性将返回 Array 的起源，Http2Session 可能被认为是权威的。

¥If the Http2Session is connected to a TLSSocket, the originSet property will return an Array of origins for which the Http2Session may be considered authoritative.

originSet 属性仅在使用安全 TLS 连接时可用。

¥The originSet property is only available when using a secure TLS connection.

http2session.pendingSettingsAck#

• <boolean>

指示 Http2Session 当前是否正在等待已发送的 SETTINGS 帧的确认。调用 http2session.settings() 方法后会是 true。一旦所有发送的 SETTINGS 帧都被确认，将是 false。

¥Indicates whether the Http2Session is currently waiting for acknowledgment of a sent SETTINGS frame. Will be true after calling the http2session.settings() method. Will be false once all sent SETTINGS frames have been acknowledged.

http2session.ping([payload, ]callback)#

• payload <Buffer> | <TypedArray> | <DataView> 可选的 ping 负载。

  ¥payload <Buffer> | <TypedArray> | <DataView> Optional ping payload.

• callback <Function>

• 返回：<boolean>

  ¥Returns: <boolean>

向连接的 HTTP/2 对等方发送 PING 帧。必须提供 callback 函数。如果发送了 PING，则该方法将返回 true，否则返回 false。

¥Sends a PING frame to the connected HTTP/2 peer. A callback function must be provided. The method will return true if the PING was sent, false otherwise.

未完成的（未确认的）ping 的最大数量由 maxOutstandingPings 配置选项决定。默认最大值为 10。

¥The maximum number of outstanding (unacknowledged) pings is determined by the maxOutstandingPings configuration option. The default maximum is 10.

如果提供，则 payload 必须是 Buffer、TypedArray 或 DataView，其中包含 8 个字节的数据，这些数据将与 PING 一起传输并与 ping 确认一起返回。

¥If provided, the payload must be a Buffer, TypedArray, or DataView containing 8 bytes of data that will be transmitted with the PING and returned with the ping acknowledgment.

将使用三个参数调用回调：如果 PING 被成功确认，则错误参数将为 null，duration 参数报告自发送 ping 和收到确认以来经过的毫秒数，以及包含 8 字节 PING 有效负载的 Buffer。

¥The callback will be invoked with three arguments: an error argument that will be null if the PING was successfully acknowledged, a duration argument that reports the number of milliseconds elapsed since the ping was sent and the acknowledgment was received, and a Buffer containing the 8-byte PING payload.

session.ping(Buffer.from('abcdefgh'), (err, duration, payload) => {
  if (!err) {
    console.log(`Ping acknowledged in ${duration} milliseconds`);
    console.log(`With payload '${payload.toString()}'`);
  }
}); 拷贝

如果未指定 payload 参数，则默认负载将是标记 PING 持续时间开始的 64 位时间戳（小端）。

¥If the payload argument is not specified, the default payload will be the 64-bit timestamp (little endian) marking the start of the PING duration.

http2session.ref()#

在此 Http2Session 实例的底层 net.Socket 上调用 ref()。

¥Calls ref() on this Http2Session instance's underlying net.Socket.

http2session.remoteSettings#

• <HTTP/2 Settings Object>

描述此 Http2Session 当前远程设置的无原型对象。远程设置由连接的 HTTP/2 对等方设置。

¥A prototype-less object describing the current remote settings of this Http2Session. The remote settings are set by the connected HTTP/2 peer.

http2session.setLocalWindowSize(windowSize)#

• windowSize <number>

设置本地端点的窗口大小。windowSize 是要设置的总窗口大小，而不是增量。

¥Sets the local endpoint's window size. The windowSize is the total window size to set, not the delta.

const http2 = require('node:http2');

const server = http2.createServer();
const expectedWindowSize = 2 ** 20;
server.on('connect', (session) => {

  // Set local window size to be 2 ** 20
  session.setLocalWindowSize(expectedWindowSize);
}); 拷贝

http2session.setTimeout(msecs, callback)#

• msecs <number>

• callback <Function>

用于设置 msecs 毫秒后 Http2Session 上没有活动时调用的回调函数。给定的 callback 已注册为 'timeout' 事件的监听器。

¥Used to set a callback function that is called when there is no activity on the Http2Session after msecs milliseconds. The given callback is registered as a listener on the 'timeout' event.

http2session.socket#

• <net.Socket> | <tls.TLSSocket>

返回 Proxy 对象，它充当 net.Socket（或 tls.TLSSocket），但将可用方法限制为可安全使用 HTTP/2 的方法。

¥Returns a Proxy object that acts as a net.Socket (or tls.TLSSocket) but limits available methods to ones safe to use with HTTP/2.

destroy、emit、end、pause、read、resume、以及 write 将抛出错误代码为 ERR_HTTP2_NO_SOCKET_MANIPULATION。有关详细信息，请参阅 Http2Session 和套接字。

¥destroy, emit, end, pause, read, resume, and write will throw an error with code ERR_HTTP2_NO_SOCKET_MANIPULATION. See Http2Session and Sockets for more information.

将在此 Http2Session 上调用 setTimeout 方法。

¥setTimeout method will be called on this Http2Session.

所有其他交互将直接路由到套接字。

¥All other interactions will be routed directly to the socket.

http2session.state#

提供有关 Http2Session 当前状态的其他信息。

¥Provides miscellaneous information about the current state of the Http2Session.

• <Object>

  • effectiveLocalWindowSize <number> Http2Session 的当前本地（接收）流控制窗口大小。

    ¥effectiveLocalWindowSize <number> The current local (receive) flow control window size for the Http2Session.

  • effectiveRecvDataLength <number> 自上次流控制 WINDOW_UPDATE 以来已接收的当前字节数。

    ¥effectiveRecvDataLength <number> The current number of bytes that have been received since the last flow control WINDOW_UPDATE.

  • nextStreamID <number> 下一次此 Http2Session 创建新 Http2Stream 时要使用的数字标识符。

    ¥nextStreamID <number> The numeric identifier to be used the next time a new Http2Stream is created by this Http2Session.

  • localWindowSize <number> 远程对等方在不接收 WINDOW_UPDATE 的情况下可以发送的字节数。

    ¥localWindowSize <number> The number of bytes that the remote peer can send without receiving a WINDOW_UPDATE.

  • lastProcStreamID <number> 最近收到 HEADERS 或 DATA 帧的 Http2Stream 的数字 ID。

    ¥lastProcStreamID <number> The numeric id of the Http2Stream for which a HEADERS or DATA frame was most recently received.

  • remoteWindowSize <number> 此 Http2Session 在不接收 WINDOW_UPDATE 的情况下可以发送的字节数。

    ¥remoteWindowSize <number> The number of bytes that this Http2Session may send without receiving a WINDOW_UPDATE.

  • outboundQueueSize <number> 当前在此 Http2Session 的出站队列中的帧数。

    ¥outboundQueueSize <number> The number of frames currently within the outbound queue for this Http2Session.

  • deflateDynamicTableSize <number> 出站标头压缩状态表的当前大小（以字节为单位）。

    ¥deflateDynamicTableSize <number> The current size in bytes of the outbound header compression state table.

  • inflateDynamicTableSize <number> 入站标头压缩状态表的当前大小（以字节为单位）。

    ¥inflateDynamicTableSize <number> The current size in bytes of the inbound header compression state table.

描述当前 Http2Session 状态的对象。

¥An object describing the current status of this Http2Session.

http2session.settings([settings][, callback])#

• settings <HTTP/2 Settings Object>

• callback <Function> 一旦会话连接或会话已连接时立即调用的回调。

  ¥callback <Function> Callback that is called once the session is connected or right away if the session is already connected.

  • err <Error> | <null>

  • settings <HTTP/2 Settings Object> 更新后的 settings 对象。

    ¥settings <HTTP/2 Settings Object> The updated settings object.

  • duration <integer>

更新此 Http2Session 的当前本地设置并向连接的 HTTP/2 对等方发送新的 SETTINGS 帧。

¥Updates the current local settings for this Http2Session and sends a new SETTINGS frame to the connected HTTP/2 peer.

一旦调用，当会话等待远程对等方确认新设置时，http2session.pendingSettingsAck 属性将为 true。

¥Once called, the http2session.pendingSettingsAck property will be true while the session is waiting for the remote peer to acknowledge the new settings.

在收到 SETTINGS 确认并触发 'localSettings' 事件之前，新设置不会生效。可以在确认未决时发送多个 SETTINGS 帧。

¥The new settings will not become effective until the SETTINGS acknowledgment is received and the 'localSettings' event is emitted. It is possible to send multiple SETTINGS frames while acknowledgment is still pending.

http2session.type#

• <number>

如果此 Http2Session 实例是服务器，则 http2session.type 将等于 http2.constants.NGHTTP2_SESSION_SERVER，如果该实例是客户端，则 http2.constants.NGHTTP2_SESSION_CLIENT 将等于。

¥The http2session.type will be equal to http2.constants.NGHTTP2_SESSION_SERVER if this Http2Session instance is a server, and http2.constants.NGHTTP2_SESSION_CLIENT if the instance is a client.

http2session.unref()#

在此 Http2Session 实例的底层 net.Socket 上调用 unref()。

¥Calls unref() on this Http2Session instance's underlying net.Socket.

类：ServerHttp2Session#

¥Class: ServerHttp2Session

• 继承：<Http2Session>

  ¥Extends: <Http2Session>

serverhttp2session.altsvc(alt, originOrStream)#

• alt <string> RFC 7838 定义的替代服务配置的描述。

  ¥alt <string> A description of the alternative service configuration as defined by RFC 7838.

• originOrStream <number> | <string> | <URL> | <Object> 指定来源的 URL 字符串（或具有 origin 属性的 Object）或由 http2stream.id 属性给出的活动 Http2Stream 的数字标识符。

  ¥originOrStream <number> | <string> | <URL> | <Object> Either a URL string specifying the origin (or an Object with an origin property) or the numeric identifier of an active Http2Stream as given by the http2stream.id property.

向连接的客户端提交 ALTSVC 帧（由 RFC 7838 定义）。

¥Submits an ALTSVC frame (as defined by RFC 7838) to the connected client.

const http2 = require('node:http2');

const server = http2.createServer();
server.on('session', (session) => {
  // Set altsvc for origin https://example.org:80
  session.altsvc('h2=":8000"', 'https://example.org:80');
});

server.on('stream', (stream) => {
  // Set altsvc for a specific stream
  stream.session.altsvc('h2=":8000"', stream.id);
}); 拷贝

发送带有特定流 ID 的 ALTSVC 帧表示备用服务与给定 Http2Stream 的来源相关联。

¥Sending an ALTSVC frame with a specific stream ID indicates that the alternate service is associated with the origin of the given Http2Stream.

alt 和原始字符串必须仅包含 ASCII 字节，并被严格解释为 ASCII 字节序列。可以传入特殊值 'clear' 以清除给定域的任何先前设置的替代服务。

¥The alt and origin string must contain only ASCII bytes and are strictly interpreted as a sequence of ASCII bytes. The special value 'clear' may be passed to clear any previously set alternative service for a given domain.

当为 originOrStream 参数传入字符串时，则它将被解析为 URL 并导出来源。例如，HTTP URL 'https://example.org/foo/bar' 的来源是 ASCII 字符串 'https://example.org'。如果给定的字符串无法解析为 URL，或者无法导出有效的来源，则会抛出错误。

¥When a string is passed for the originOrStream argument, it will be parsed as a URL and the origin will be derived. For instance, the origin for the HTTP URL 'https://example.org/foo/bar' is the ASCII string 'https://example.org'. An error will be thrown if either the given string cannot be parsed as a URL or if a valid origin cannot be derived.

URL 对象，或任何具有 origin 属性的对象，都可以作为 originOrStream 传入，在这种情况下，将使用 origin 属性的值。origin 属性的值必须是正确序列化的 ASCII 来源。

¥A URL object, or any object with an origin property, may be passed as originOrStream, in which case the value of the origin property will be used. The value of the origin property must be a properly serialized ASCII origin.

指定替代服务#

¥Specifying alternative services

alt 参数的格式由 RFC 7838 严格定义为一个 ASCII 字符串，其中包含与特定主机和端口关联的以逗号分隔的 "alternative" 协议列表。

¥The format of the alt parameter is strictly defined by RFC 7838 as an ASCII string containing a comma-delimited list of "alternative" protocols associated with a specific host and port.

例如，值 'h2="example.org:81"' 表示 HTTP/2 协议在主机 'example.org' 上的 TCP/IP 端口 81 上可用。主机和端口必须包含在引号 (") 字符中。

¥For example, the value 'h2="example.org:81"' indicates that the HTTP/2 protocol is available on the host 'example.org' on TCP/IP port 81. The host and port must be contained within the quote (") characters.

可以指定多个备选方案，例如：'h2="example.org:81", h2=":82"'。

¥Multiple alternatives may be specified, for instance: 'h2="example.org:81", h2=":82"'.

协议标识符（示例中的 'h2'）可以是任何有效的 ALPN 协议 ID。

¥The protocol identifier ('h2' in the examples) may be any valid ALPN Protocol ID.

这些值的语法未经 Node.js 实现验证，而是按照用户提供的或从对等方接收的方式传入。

¥The syntax of these values is not validated by the Node.js implementation and are passed through as provided by the user or received from the peer.

serverhttp2session.origin(...origins)#

• origins <string> | <URL> | <Object> 一个或多个 URL 字符串作为单独的参数传入。

  ¥origins <string> | <URL> | <Object> One or more URL Strings passed as separate arguments.

向连接的客户端提交 ORIGIN 帧（由 RFC 8336 定义）以通告服务器能够提供权威响应的源集。

¥Submits an ORIGIN frame (as defined by RFC 8336) to the connected client to advertise the set of origins for which the server is capable of providing authoritative responses.

const http2 = require('node:http2');
const options = getSecureOptionsSomehow();
const server = http2.createSecureServer(options);
server.on('stream', (stream) => {
  stream.respond();
  stream.end('ok');
});
server.on('session', (session) => {
  session.origin('https://example.com', 'https://example.org');
}); 拷贝

当字符串作为 origin 传入时，则它会被解析为 URL 并导出来源。例如，HTTP URL 'https://example.org/foo/bar' 的来源是 ASCII 字符串 'https://example.org'。如果给定的字符串无法解析为 URL，或者无法导出有效的来源，则会抛出错误。

¥When a string is passed as an origin, it will be parsed as a URL and the origin will be derived. For instance, the origin for the HTTP URL 'https://example.org/foo/bar' is the ASCII string 'https://example.org'. An error will be thrown if either the given string cannot be parsed as a URL or if a valid origin cannot be derived.

URL 对象，或任何具有 origin 属性的对象，都可以作为 origin 传入，在这种情况下，将使用 origin 属性的值。origin 属性的值必须是正确序列化的 ASCII 来源。

¥A URL object, or any object with an origin property, may be passed as an origin, in which case the value of the origin property will be used. The value of the origin property must be a properly serialized ASCII origin.

或者，在使用 http2.createSecureServer() 方法创建新的 HTTP/2 服务器时可以使用 origins 选项：

¥Alternatively, the origins option may be used when creating a new HTTP/2 server using the http2.createSecureServer() method:

const http2 = require('node:http2');
const options = getSecureOptionsSomehow();
options.origins = ['https://example.com', 'https://example.org'];
const server = http2.createSecureServer(options);
server.on('stream', (stream) => {
  stream.respond();
  stream.end('ok');
}); 拷贝

类：ClientHttp2Session#

¥Class: ClientHttp2Session

• 继承：<Http2Session>

  ¥Extends: <Http2Session>

事件：'altsvc'#

¥Event: 'altsvc'

• alt <string>

• origin <string>

• streamId <number>

每当客户端接收到 ALTSVC 帧时，则会触发 'altsvc' 事件。事件使用 ALTSVC 值、来源和流 ID 触发。如果在 ALTSVC 帧中没有提供 origin，则 origin 将是空字符串。

¥The 'altsvc' event is emitted whenever an ALTSVC frame is received by the client. The event is emitted with the ALTSVC value, origin, and stream ID. If no origin is provided in the ALTSVC frame, origin will be an empty string.

const http2 = require('node:http2');
const client = http2.connect('https://example.org');

client.on('altsvc', (alt, origin, streamId) => {
  console.log(alt);
  console.log(origin);
  console.log(streamId);
}); 拷贝

事件：'origin'#

¥Event: 'origin'

• origins <string[]>

每当客户端接收到 ORIGIN 帧时，则会触发 'origin' 事件。该事件使用 origin 字符串的数组触发。http2session.originSet 将被更新以包含接收到的来源。

¥The 'origin' event is emitted whenever an ORIGIN frame is received by the client. The event is emitted with an array of origin strings. The http2session.originSet will be updated to include the received origins.

const http2 = require('node:http2');
const client = http2.connect('https://example.org');

client.on('origin', (origins) => {
  for (let n = 0; n < origins.length; n++)
    console.log(origins[n]);
}); 拷贝

只有在使用安全 TLS 连接时才会触发 'origin' 事件。

¥The 'origin' event is only emitted when using a secure TLS connection.

clienthttp2session.request(headers[, options])#

• headers <HTTP/2 Headers Object>

• options <Object>

  • endStream <boolean> true 如果 Http2Stream 可写端最初应关闭，例如发送不应期望有效负载正文的 GET 请求时。

    ¥endStream <boolean> true if the Http2Stream writable side should be closed initially, such as when sending a GET request that should not expect a payload body.

  • exclusive <boolean> 当 true 和 parent 标识父流时，创建的流将成为父流的唯一直接依赖，所有其他现有依赖都成为新创建流的依赖。默认值：false。

    ¥exclusive <boolean> When true and parent identifies a parent Stream, the created stream is made the sole direct dependency of the parent, with all other existing dependents made a dependent of the newly created stream. Default: false.

  • parent <number> 指定新创建的流所依赖的流的数字标识符。

    ¥parent <number> Specifies the numeric identifier of a stream the newly created stream is dependent on.

  • weight <number> 指定流相对于具有相同 parent 的其他流的相对依赖。该值为 1 到 256（含）之间的数字。

    ¥weight <number> Specifies the relative dependency of a stream in relation to other streams with the same parent. The value is a number between 1 and 256 (inclusive).

  • waitForTrailers <boolean> 当为 true 时，Http2Stream 将在发送完最后的 DATA 帧后触发 'wantTrailers' 事件。

    ¥waitForTrailers <boolean> When true, the Http2Stream will emit the 'wantTrailers' event after the final DATA frame has been sent.

  • signal <AbortSignal> 可用于中止正在进行的请求的中止信号。

    ¥signal <AbortSignal> An AbortSignal that may be used to abort an ongoing request.

• 返回：<ClientHttp2Stream>

  ¥Returns: <ClientHttp2Stream>

仅对于 HTTP/2 客户端 Http2Session 实例，http2session.request() 创建并返回 Http2Stream 实例，该实例可用于向连接的服务器发送 HTTP/2 请求。

¥For HTTP/2 Client Http2Session instances only, the http2session.request() creates and returns an Http2Stream instance that can be used to send an HTTP/2 request to the connected server.

当第一次创建 ClientHttp2Session 时，套接字可能尚未连接。如果在此期间调用 clienthttp2session.request()，则实际的请求将被推迟到套接字准备就绪。如果在实际的请求执行之前关闭了 session，则抛出 ERR_HTTP2_GOAWAY_SESSION。

¥When a ClientHttp2Session is first created, the socket may not yet be connected. if clienthttp2session.request() is called during this time, the actual request will be deferred until the socket is ready to go. If the session is closed before the actual request be executed, an ERR_HTTP2_GOAWAY_SESSION is thrown.

此方法仅在 http2session.type 等于 http2.constants.NGHTTP2_SESSION_CLIENT 时可用。

¥This method is only available if http2session.type is equal to http2.constants.NGHTTP2_SESSION_CLIENT.

const http2 = require('node:http2');
const clientSession = http2.connect('https://localhost:1234');
const {
  HTTP2_HEADER_PATH,
  HTTP2_HEADER_STATUS
} = http2.constants;

const req = clientSession.request({ [HTTP2_HEADER_PATH]: '/' });
req.on('response', (headers) => {
  console.log(headers[HTTP2_HEADER_STATUS]);
  req.on('data', (chunk) => { /* .. */ });
  req.on('end', () => { /* .. */ });
}); 拷贝

当设置了 options.waitForTrailers 选项时，在将要发送的最后一块有效负载数据排队后立即触发 'wantTrailers' 事件。然后可以调用 http2stream.sendTrailers() 方法将尾随标头发送到对等方。

¥When the options.waitForTrailers option is set, the 'wantTrailers' event is emitted immediately after queuing the last chunk of payload data to be sent. The http2stream.sendTrailers() method can then be called to send trailing headers to the peer.

当设置了 options.waitForTrailers，则传输完最后的 DATA 帧时，Http2Stream 不会自动关闭。用户代码必须调用 http2stream.sendTrailers() 或 http2stream.close() 来关闭 Http2Stream。

¥When options.waitForTrailers is set, the Http2Stream will not automatically close when the final DATA frame is transmitted. User code must call either http2stream.sendTrailers() or http2stream.close() to close the Http2Stream.

当 options.signal 设置为 AbortSignal，然后调用相应 AbortController 上的 abort 时，则请求将使用 AbortError 错误触发 'error' 事件。

¥When options.signal is set with an AbortSignal and then abort on the corresponding AbortController is called, the request will emit an 'error' event with an AbortError error.

:method 和 :path 伪标头在 headers 中没有指定，它们分别默认为：

¥The :method and :path pseudo-headers are not specified within headers, they respectively default to:

• :method = 'GET'

• :path = /

类：Http2Stream#

¥Class: Http2Stream

• 继承：<stream.Duplex>

  ¥Extends: <stream.Duplex>

Http2Stream 类的每个实例代表一个通过 Http2Session 实例的双向 HTTP/2 通信流。任何单个 Http2Session 在其生命周期内最多可以有 2³¹-1 个 Http2Stream 实例。

¥Each instance of the Http2Stream class represents a bidirectional HTTP/2 communications stream over an Http2Session instance. Any single Http2Session may have up to 2³¹-1 Http2Stream instances over its lifetime.

用户代码不会直接构造 Http2Stream 实例。而是，这些是通过 Http2Session 实例创建、管理并提供给用户代码的。在服务器上，创建 Http2Stream 实例是为了响应传入的 HTTP 请求（并通过 'stream' 事件传给用户代码），或者响应对 http2stream.pushStream() 方法的调用。在客户端，当调用 http2session.request() 方法或响应传入的 'push' 事件时，会创建并返回 Http2Stream 实例。

¥User code will not construct Http2Stream instances directly. Rather, these are created, managed, and provided to user code through the Http2Session instance. On the server, Http2Stream instances are created either in response to an incoming HTTP request (and handed off to user code via the 'stream' event), or in response to a call to the http2stream.pushStream() method. On the client, Http2Stream instances are created and returned when either the http2session.request() method is called, or in response to an incoming 'push' event.

Http2Stream 类是 ServerHttp2Stream 和 ClientHttp2Stream 类的基础，每个类分别由服务器端或客户端专门使用。

¥The Http2Stream class is a base for the ServerHttp2Stream and ClientHttp2Stream classes, each of which is used specifically by either the Server or Client side, respectively.

所有 Http2Stream 实例都是 Duplex 流。Duplex 的 Writable 端用于向连接的对端发送数据，而 Readable 端用于接收连接的对端发送的数据。

¥All Http2Stream instances are Duplex streams. The Writable side of the Duplex is used to send data to the connected peer, while the Readable side is used to receive data sent by the connected peer.

Http2Stream 的默认文本字符编码为 UTF-8。当使用 Http2Stream 发送文本时，使用 'content-type' 标头设置字符编码。

¥The default text character encoding for an Http2Stream is UTF-8. When using an Http2Stream to send text, use the 'content-type' header to set the character encoding.

stream.respond({
  'content-type': 'text/html; charset=utf-8',
  ':status': 200
}); 拷贝

Http2Stream 生命周期#

¥Http2Stream Lifecycle

创建#

¥Creation

在服务器端，ServerHttp2Stream 的实例是在以下任一情况下创建的：

¥On the server side, instances of ServerHttp2Stream are created either when:

• 接收到新的 HTTP/2 HEADERS 帧，其中包含以前未使用的流 ID；

  ¥A new HTTP/2 HEADERS frame with a previously unused stream ID is received;

• 调用了 http2stream.pushStream() 方法。

  ¥The http2stream.pushStream() method is called.

在客户端，ClientHttp2Stream 的实例是在调用 http2session.request() 方法时创建的。

¥On the client side, instances of ClientHttp2Stream are created when the http2session.request() method is called.

在客户端，如果父 Http2Session 尚未完全建立，则 http2session.request() 返回的 Http2Stream 实例可能不会立即准备好使用。在这种情况下，在 Http2Stream 上调用的操作将被缓冲，直到触发 'ready' 事件。用户代码应该很少，如果有的话，需要直接处理 'ready' 事件。Http2Stream 的就绪状态可以通过检查 http2stream.id 的值来确定。如果值为 undefined，则流尚未准备好使用。

¥On the client, the Http2Stream instance returned by http2session.request() may not be immediately ready for use if the parent Http2Session has not yet been fully established. In such cases, operations called on the Http2Stream will be buffered until the 'ready' event is emitted. User code should rarely, if ever, need to handle the 'ready' event directly. The ready status of an Http2Stream can be determined by checking the value of http2stream.id. If the value is undefined, the stream is not yet ready for use.

解构#

¥Destruction

所有 Http2Stream 实例都在以下情况下被销毁：

¥All Http2Stream instances are destroyed either when:

• 已连接的对等方接收到流的 RST_STREAM 帧，并且（仅对于客户端流）已读取待处理数据。

  ¥An RST_STREAM frame for the stream is received by the connected peer, and (for client streams only) pending data has been read.

• 调用了 http2stream.close() 方法，并且（仅对于客户端流）已读取待处理数据。

  ¥The http2stream.close() method is called, and (for client streams only) pending data has been read.

• 调用 http2stream.destroy() 或 http2session.destroy() 方法。

  ¥The http2stream.destroy() or http2session.destroy() methods are called.

当 Http2Stream 实例被销毁时，则将尝试向连接的对等方发送 RST_STREAM 帧。

¥When an Http2Stream instance is destroyed, an attempt will be made to send an RST_STREAM frame to the connected peer.

当 Http2Stream 实例被销毁时，则将会触发 'close' 事件。因为 Http2Stream 是 stream.Duplex 的实例，所以如果流数据当前正在流动，则 'end' 事件也会被触发。如果 http2stream.destroy() 被作为第一个参数传入的 Error 被调用，则 'error' 事件也可能被触发。

¥When the Http2Stream instance is destroyed, the 'close' event will be emitted. Because Http2Stream is an instance of stream.Duplex, the 'end' event will also be emitted if the stream data is currently flowing. The 'error' event may also be emitted if http2stream.destroy() was called with an Error passed as the first argument.

在 Http2Stream 被销毁后，http2stream.destroyed 属性将是 true，http2stream.rstCode 属性将指定 RST_STREAM 错误代码。Http2Stream 实例一旦销毁就不再可用。

¥After the Http2Stream has been destroyed, the http2stream.destroyed property will be true and the http2stream.rstCode property will specify the RST_STREAM error code. The Http2Stream instance is no longer usable once destroyed.

事件：'aborted'#

¥Event: 'aborted'

每当 Http2Stream 实例在通信中途异常中止时，就会触发 'aborted' 事件。其监听器不需要任何参数。

¥The 'aborted' event is emitted whenever a Http2Stream instance is abnormally aborted in mid-communication. Its listener does not expect any arguments.

只有在 Http2Stream 可写端尚未结束时才会触发 'aborted' 事件。

¥The 'aborted' event will only be emitted if the Http2Stream writable side has not been ended.

事件：'close'#

¥Event: 'close'

'close' 事件在 Http2Stream 被销毁时触发。一旦触发此事件，则 Http2Stream 实例将不再可用。

¥The 'close' event is emitted when the Http2Stream is destroyed. Once this event is emitted, the Http2Stream instance is no longer usable.

可以使用 http2stream.rstCode 属性检索关闭流时使用的 HTTP/2 错误代码。如果代码是除 NGHTTP2_NO_ERROR (0) 以外的任何值，则也将触发 'error' 事件。

¥The HTTP/2 error code used when closing the stream can be retrieved using the http2stream.rstCode property. If the code is any value other than NGHTTP2_NO_ERROR (0), an 'error' event will have also been emitted.

事件：'error'#

¥Event: 'error'

• error <Error>

'error' 事件在处理 Http2Stream 期间发生错误时触发。

¥The 'error' event is emitted when an error occurs during the processing of an Http2Stream.

事件：'frameError'#

¥Event: 'frameError'

• type <integer> 帧类型。

  ¥type <integer> The frame type.

• code <integer> 错误代码。

  ¥code <integer> The error code.

• id <integer> 流 id（或如果帧不与流相关联，则为 0）。

  ¥id <integer> The stream id (or 0 if the frame isn't associated with a stream).

当尝试发送帧时发生错误时会触发 'frameError' 事件。当调用时，句柄函数将接收标识帧类型的整数参数和标识错误代码的整数参数。Http2Stream 实例将在 'frameError' 事件触发后立即销毁。

¥The 'frameError' event is emitted when an error occurs while attempting to send a frame. When invoked, the handler function will receive an integer argument identifying the frame type, and an integer argument identifying the error code. The Http2Stream instance will be destroyed immediately after the 'frameError' event is emitted.

事件：'ready'#

¥Event: 'ready'

'ready' 事件在 Http2Stream 已打开、已分配 id 且可以使用时触发。监听器不需要任何参数。

¥The 'ready' event is emitted when the Http2Stream has been opened, has been assigned an id, and can be used. The listener does not expect any arguments.

事件：'timeout'#

¥Event: 'timeout'

在使用 http2stream.setTimeout() 设置的毫秒数内没有收到此 Http2Stream 的活动后，则将触发 'timeout' 事件。其监听器不需要任何参数。

¥The 'timeout' event is emitted after no activity is received for this Http2Stream within the number of milliseconds set using http2stream.setTimeout(). Its listener does not expect any arguments.

事件：'trailers'#

¥Event: 'trailers'

• headers <HTTP/2 Headers Object> 描述标头的对象

  ¥headers <HTTP/2 Headers Object> An object describing the headers

• flags <number> 相关的数字标志

  ¥flags <number> The associated numeric flags

当接收到与尾随标头字段关联的标头块时，则会触发 'trailers' 事件。监听器回调传递 HTTP/2 标头对象 和与标头关联的标志。

¥The 'trailers' event is emitted when a block of headers associated with trailing header fields is received. The listener callback is passed the HTTP/2 Headers Object and flags associated with the headers.

如果在收到标尾之前调用 http2stream.end() 并且未读取或监听传入数据，则可能不会触发此事件。

¥This event might not be emitted if http2stream.end() is called before trailers are received and the incoming data is not being read or listened for.

stream.on('trailers', (headers, flags) => {
  console.log(headers);
}); 拷贝

事件：'wantTrailers'#

¥Event: 'wantTrailers'

'wantTrailers' 事件在 Http2Stream 已将要在帧上发送的最后 DATA 帧排队并且 Http2Stream 准备好发送尾随标头时触发。在发起请求或响应时，必须设置 waitForTrailers 选项才能触发此事件。

¥The 'wantTrailers' event is emitted when the Http2Stream has queued the final DATA frame to be sent on a frame and the Http2Stream is ready to send trailing headers. When initiating a request or response, the waitForTrailers option must be set for this event to be emitted.

http2stream.aborted#

• <boolean>

如果 Http2Stream 实例异常中止，则设置为 true。当设置时，则 'aborted' 事件将被触发。

¥Set to true if the Http2Stream instance was aborted abnormally. When set, the 'aborted' event will have been emitted.

http2stream.bufferSize#

• <number>

此属性显示当前缓冲要写入的字符数。详见 net.Socket.bufferSize。

¥This property shows the number of characters currently buffered to be written. See net.Socket.bufferSize for details.

http2stream.close(code[, callback])#

• code <number> 标识错误代码的无符号 32 位整数。默认值：http2.constants.NGHTTP2_NO_ERROR (0x00).

  ¥code <number> Unsigned 32-bit integer identifying the error code. Default: http2.constants.NGHTTP2_NO_ERROR (0x00).

• callback <Function> 注册了可选函数来监听 'close' 事件。

  ¥callback <Function> An optional function registered to listen for the 'close' event.

通过向连接的 HTTP/2 对等体发送 RST_STREAM 帧来关闭 Http2Stream 实例。

¥Closes the Http2Stream instance by sending an RST_STREAM frame to the connected HTTP/2 peer.

http2stream.closed#

• <boolean>

如果 Http2Stream 实例已关闭，则设置为 true。

¥Set to true if the Http2Stream instance has been closed.

http2stream.destroyed#

• <boolean>

如果 Http2Stream 实例已被销毁且不再可用，则设置为 true。

¥Set to true if the Http2Stream instance has been destroyed and is no longer usable.

http2stream.endAfterHeaders#

• <boolean>

如果在收到的请求或响应 HEADERS 帧中设置了 END_STREAM 标志，则设置为 true，表示不应接收额外数据，并且将关闭 Http2Stream 的可读端。

¥Set to true if the END_STREAM flag was set in the request or response HEADERS frame received, indicating that no additional data should be received and the readable side of the Http2Stream will be closed.

http2stream.id#

• <number> | <undefined>

此 Http2Stream 实例的数字流标识符如果尚未分配流标识符，则设置为 undefined。

¥The numeric stream identifier of this Http2Stream instance. Set to undefined if the stream identifier has not yet been assigned.

http2stream.pending#

• <boolean>

如果尚未为 Http2Stream 实例分配数字流标识符，则设置为 true。

¥Set to true if the Http2Stream instance has not yet been assigned a numeric stream identifier.

http2stream.priority(options)#

• options <Object>

  • exclusive <boolean> 当 true 和 parent 标识父流时，此流将成为父流的唯一直接依赖，所有其他现有依赖都成为此流的依赖。默认值：false。

    ¥exclusive <boolean> When true and parent identifies a parent Stream, this stream is made the sole direct dependency of the parent, with all other existing dependents made a dependent of this stream. Default: false.

  • parent <number> 指定此流所依赖的流的数字标识符。

    ¥parent <number> Specifies the numeric identifier of a stream this stream is dependent on.

  • weight <number> 指定流相对于具有相同 parent 的其他流的相对依赖。该值为 1 到 256（含）之间的数字。

    ¥weight <number> Specifies the relative dependency of a stream in relation to other streams with the same parent. The value is a number between 1 and 256 (inclusive).

  • silent <boolean> 当为 true 时，本地改变优先级，而不向连接的对端发送 PRIORITY 帧。

    ¥silent <boolean> When true, changes the priority locally without sending a PRIORITY frame to the connected peer.

更新此 Http2Stream 实例的优先级。

¥Updates the priority for this Http2Stream instance.

http2stream.rstCode#

• <number>

设置为 RST_STREAM 错误码 在从连接的对等方接收到 RST_STREAM 帧、调用 http2stream.close() 或 http2stream.destroy() 后销毁 Http2Stream 时报告。如果 Http2Stream 尚未关闭，则为 undefined。

¥Set to the RST_STREAM error code reported when the Http2Stream is destroyed after either receiving an RST_STREAM frame from the connected peer, calling http2stream.close(), or http2stream.destroy(). Will be undefined if the Http2Stream has not been closed.

http2stream.sentHeaders#

• <HTTP/2 Headers Object>

包含为此 Http2Stream 发送的出站标头的对象。

¥An object containing the outbound headers sent for this Http2Stream.

http2stream.sentInfoHeaders#

• <HTTP/2 Headers Object[]>

包含为此 Http2Stream 发送的出站信息（附加）标头的对象数组。

¥An array of objects containing the outbound informational (additional) headers sent for this Http2Stream.

http2stream.sentTrailers#

• <HTTP/2 Headers Object>

包含为此 HttpStream 发送的出站尾随标头的对象。

¥An object containing the outbound trailers sent for this HttpStream.

http2stream.session#

• <Http2Session>

对拥有此 Http2Stream 的 Http2Session 实例的引用。在 Http2Stream 实例销毁后，值为 undefined。

¥A reference to the Http2Session instance that owns this Http2Stream. The value will be undefined after the Http2Stream instance is destroyed.

http2stream.setTimeout(msecs, callback)#

• msecs <number>

• callback <Function>

const http2 = require('node:http2');
const client = http2.connect('http://example.org:8000');
const { NGHTTP2_CANCEL } = http2.constants;
const req = client.request({ ':path': '/' });

// Cancel the stream if there's no activity after 5 seconds
req.setTimeout(5000, () => req.close(NGHTTP2_CANCEL)); 拷贝

http2stream.state#

提供有关 Http2Stream 当前状态的其他信息。

¥Provides miscellaneous information about the current state of the Http2Stream.

• <Object>

  • localWindowSize <number> 连接的对等体可以为此 Http2Stream 发送的字节数，而不会收到 WINDOW_UPDATE。

    ¥localWindowSize <number> The number of bytes the connected peer may send for this Http2Stream without receiving a WINDOW_UPDATE.

  • state <number> 指示由 nghttp2 确定的 Http2Stream 的低层当前状态的标志。

    ¥state <number> A flag indicating the low-level current state of the Http2Stream as determined by nghttp2.

  • localClose <number> 1（如果该 Http2Stream 已在本地关闭）。

    ¥localClose <number> 1 if this Http2Stream has been closed locally.

  • remoteClose <number> 1（如果此 Http2Stream 已远程关闭）。

    ¥remoteClose <number> 1 if this Http2Stream has been closed remotely.

  • sumDependencyWeight <number> 使用 PRIORITY 帧指定的依赖于此 Http2Stream 的所有 Http2Stream 实例的总权重。

    ¥sumDependencyWeight <number> The sum weight of all Http2Stream instances that depend on this Http2Stream as specified using PRIORITY frames.

  • weight <number> 此 Http2Stream 的优先权重。

    ¥weight <number> The priority weight of this Http2Stream.

此 Http2Stream 的当前状态。

¥A current state of this Http2Stream.

http2stream.sendTrailers(headers)#

• headers <HTTP/2 Headers Object>

向连接的 HTTP/2 对等端发送尾随的 HEADERS 帧。此方法将导致 Http2Stream 立即关闭，并且只能在 'wantTrailers' 事件触发后调用。当发送请求或发送响应时，必须设置 options.waitForTrailers 选项，以便在最后的 DATA 帧之后保持 Http2Stream 打开，以便可以发送尾随标头。

¥Sends a trailing HEADERS frame to the connected HTTP/2 peer. This method will cause the Http2Stream to be immediately closed and must only be called after the 'wantTrailers' event has been emitted. When sending a request or sending a response, the options.waitForTrailers option must be set in order to keep the Http2Stream open after the final DATA frame so that trailers can be sent.

const http2 = require('node:http2');
const server = http2.createServer();
server.on('stream', (stream) => {
  stream.respond(undefined, { waitForTrailers: true });
  stream.on('wantTrailers', () => {
    stream.sendTrailers({ xyz: 'abc' });
  });
  stream.end('Hello World');
}); 拷贝

HTTP/1 规范禁止尾随标头包含 HTTP/2 伪标头字段（例如 ':method'、':path' 等）。

¥The HTTP/1 specification forbids trailers from containing HTTP/2 pseudo-header fields (e.g. ':method', ':path', etc).

类：ClientHttp2Stream#

¥Class: ClientHttp2Stream

• 延长 <Http2Stream>

  ¥Extends <Http2Stream>

ClientHttp2Stream 类是 Http2Stream 的扩展，专门用于 HTTP/2 客户端。客户端上的 Http2Stream 实例提供仅与客户端相关的事件，例如 'response' 和 'push'。

¥The ClientHttp2Stream class is an extension of Http2Stream that is used exclusively on HTTP/2 Clients. Http2Stream instances on the client provide events such as 'response' and 'push' that are only relevant on the client.

事件：'continue'#

¥Event: 'continue'

当服务器发送 100 Continue 状态时触发，通常是因为请求包含 Expect: 100-continue。这是客户端应该发送请求正文的指令。

¥Emitted when the server sends a 100 Continue status, usually because the request contained Expect: 100-continue. This is an instruction that the client should send the request body.

事件：'headers'#

¥Event: 'headers'

• headers <HTTP/2 Headers Object>

• flags <number>

当接收到流的附加标头块时，例如接收到 1xx 信息标头块时，则会触发 'headers' 事件。监听器回调传递 HTTP/2 标头对象 和与标头关联的标志。

¥The 'headers' event is emitted when an additional block of headers is received for a stream, such as when a block of 1xx informational headers is received. The listener callback is passed the HTTP/2 Headers Object and flags associated with the headers.

stream.on('headers', (headers, flags) => {
  console.log(headers);
}); 拷贝

事件：'push'#

¥Event: 'push'

• headers <HTTP/2 Headers Object>

• flags <number>

当接收到服务器推送流的响应头时，则会触发 'push' 事件。监听器回调传递 HTTP/2 标头对象 和与标头关联的标志。

¥The 'push' event is emitted when response headers for a Server Push stream are received. The listener callback is passed the HTTP/2 Headers Object and flags associated with the headers.

stream.on('push', (headers, flags) => {
  console.log(headers);
}); 拷贝

事件：'response'#

¥Event: 'response'

• headers <HTTP/2 Headers Object>

• flags <number>

当从连接的 HTTP/2 服务器收到此流的响应 HEADERS 帧时，则将触发 'response' 事件。使用两个参数调用监听器：包含接收到的 HTTP/2 标头对象 的 Object，以及与标头关联的标志。

¥The 'response' event is emitted when a response HEADERS frame has been received for this stream from the connected HTTP/2 server. The listener is invoked with two arguments: an Object containing the received HTTP/2 Headers Object, and flags associated with the headers.

const http2 = require('node:http2');
const client = http2.connect('https://localhost');
const req = client.request({ ':path': '/' });
req.on('response', (headers, flags) => {
  console.log(headers[':status']);
}); 拷贝

类：ServerHttp2Stream#

¥Class: ServerHttp2Stream

• 继承：<Http2Stream>

  ¥Extends: <Http2Stream>

ServerHttp2Stream 类是 Http2Stream 的扩展，专门用于 HTTP/2 服务器。服务器上的 Http2Stream 实例提供了仅与服务器相关的其他方法，例如 http2stream.pushStream() 和 http2stream.respond()。

¥The ServerHttp2Stream class is an extension of Http2Stream that is used exclusively on HTTP/2 Servers. Http2Stream instances on the server provide additional methods such as http2stream.pushStream() and http2stream.respond() that are only relevant on the server.

http2stream.additionalHeaders(headers)#

• headers <HTTP/2 Headers Object>

向连接的 HTTP/2 对等方发送额外的信息性 HEADERS 帧。

¥Sends an additional informational HEADERS frame to the connected HTTP/2 peer.

http2stream.headersSent#

• <boolean>

如果标头被发送则为 true，否则为 false（只读）。

¥True if headers were sent, false otherwise (read-only).

http2stream.pushAllowed#

• <boolean>

只读属性映射到远程客户端最近的 SETTINGS 帧的 SETTINGS_ENABLE_PUSH 标志。如果远程节点接受推送流，则为 true，否则为 false。同一个 Http2Session 中的每个 Http2Stream 的设置都是相同的。

¥Read-only property mapped to the SETTINGS_ENABLE_PUSH flag of the remote client's most recent SETTINGS frame. Will be true if the remote peer accepts push streams, false otherwise. Settings are the same for every Http2Stream in the same Http2Session.

http2stream.pushStream(headers[, options], callback)#

• headers <HTTP/2 Headers Object>

• options <Object>

  • exclusive <boolean> 当 true 和 parent 标识父流时，创建的流将成为父流的唯一直接依赖，所有其他现有依赖都成为新创建流的依赖。默认值：false。

    ¥exclusive <boolean> When true and parent identifies a parent Stream, the created stream is made the sole direct dependency of the parent, with all other existing dependents made a dependent of the newly created stream. Default: false.

  • parent <number> 指定新创建的流所依赖的流的数字标识符。

    ¥parent <number> Specifies the numeric identifier of a stream the newly created stream is dependent on.

• callback <Function> 推送流启动后调用的回调。

  ¥callback <Function> Callback that is called once the push stream has been initiated.

  • err <Error>

  • pushStream <ServerHttp2Stream> 返回的 pushStream 对象。

    ¥pushStream <ServerHttp2Stream> The returned pushStream object.

  • headers <HTTP/2 Headers Object> 用于启动 pushStream 的标头对象。

    ¥headers <HTTP/2 Headers Object> Headers object the pushStream was initiated with.

启动推送流。使用为作为第二个参数传入的推送流创建的新 Http2Stream 实例或作为第一个参数传入的 Error 调用回调。

¥Initiates a push stream. The callback is invoked with the new Http2Stream instance created for the push stream passed as the second argument, or an Error passed as the first argument.

const http2 = require('node:http2');
const server = http2.createServer();
server.on('stream', (stream) => {
  stream.respond({ ':status': 200 });
  stream.pushStream({ ':path': '/' }, (err, pushStream, headers) => {
    if (err) throw err;
    pushStream.respond({ ':status': 200 });
    pushStream.end('some pushed data');
  });
  stream.end('some data');
}); 拷贝

HEADERS 帧中不允许设置推流的权重。将 weight 值传给 http2stream.priority，并将 silent 选项设置为 true，以启用并发流之间的服务器端带宽平衡。

¥Setting the weight of a push stream is not allowed in the HEADERS frame. Pass a weight value to http2stream.priority with the silent option set to true to enable server-side bandwidth balancing between concurrent streams.

不允许从推送的流中调用 http2stream.pushStream() 并且会抛出错误。

¥Calling http2stream.pushStream() from within a pushed stream is not permitted and will throw an error.

http2stream.respond([headers[, options]])#

• headers <HTTP/2 Headers Object>

• options <Object>

  • endStream <boolean> 设置为 true 表示响应将不包含有效负载数据。

    ¥endStream <boolean> Set to true to indicate that the response will not include payload data.

  • waitForTrailers <boolean> 当为 true 时，Http2Stream 将在发送完最后的 DATA 帧后触发 'wantTrailers' 事件。

    ¥waitForTrailers <boolean> When true, the Http2Stream will emit the 'wantTrailers' event after the final DATA frame has been sent.

const http2 = require('node:http2');
const server = http2.createServer();
server.on('stream', (stream) => {
  stream.respond({ ':status': 200 });
  stream.end('some data');
}); 拷贝

发起响应。当设置了 options.waitForTrailers 选项时，'wantTrailers' 事件将在将要发送的最后一块有效负载数据排队后立即触发。然后可以使用 http2stream.sendTrailers() 方法将尾随标头字段发送到对等方。

¥Initiates a response. When the options.waitForTrailers option is set, the 'wantTrailers' event will be emitted immediately after queuing the last chunk of payload data to be sent. The http2stream.sendTrailers() method can then be used to sent trailing header fields to the peer.

当设置了 options.waitForTrailers，则传输完最后的 DATA 帧时，Http2Stream 不会自动关闭。用户代码必须调用 http2stream.sendTrailers() 或 http2stream.close() 来关闭 Http2Stream。

¥When options.waitForTrailers is set, the Http2Stream will not automatically close when the final DATA frame is transmitted. User code must call either http2stream.sendTrailers() or http2stream.close() to close the Http2Stream.

const http2 = require('node:http2');
const server = http2.createServer();
server.on('stream', (stream) => {
  stream.respond({ ':status': 200 }, { waitForTrailers: true });
  stream.on('wantTrailers', () => {
    stream.sendTrailers({ ABC: 'some value to send' });
  });
  stream.end('some data');
}); 拷贝

http2stream.respondWithFD(fd[, headers[, options]])#

• fd <number> | <FileHandle> 可读的文件描述符。

  ¥fd <number> | <FileHandle> A readable file descriptor.

• headers <HTTP/2 Headers Object>

• options <Object>

  • statCheck <Function>

  • waitForTrailers <boolean> 当为 true 时，Http2Stream 将在发送完最后的 DATA 帧后触发 'wantTrailers' 事件。

    ¥waitForTrailers <boolean> When true, the Http2Stream will emit the 'wantTrailers' event after the final DATA frame has been sent.

  • offset <number> 开始读取的偏移位置。

    ¥offset <number> The offset position at which to begin reading.

  • length <number> 从文件描述符发送的数据量。

    ¥length <number> The amount of data from the fd to send.

启动响应，其数据从给定的文件描述符中读取。不对给定的文件描述符进行验证。如果在尝试使用文件描述符读取数据时发生错误，则 Http2Stream 将使用标准 INTERNAL_ERROR 代码使用 RST_STREAM 帧关闭。

¥Initiates a response whose data is read from the given file descriptor. No validation is performed on the given file descriptor. If an error occurs while attempting to read data using the file descriptor, the Http2Stream will be closed using an RST_STREAM frame using the standard INTERNAL_ERROR code.

当使用时，Http2Stream 对象的 Duplex 接口会自动关闭。

¥When used, the Http2Stream object's Duplex interface will be closed automatically.

const http2 = require('node:http2');
const fs = require('node:fs');

const server = http2.createServer();
server.on('stream', (stream) => {
  const fd = fs.openSync('/some/file', 'r');

  const stat = fs.fstatSync(fd);
  const headers = {
    'content-length': stat.size,
    'last-modified': stat.mtime.toUTCString(),
    'content-type': 'text/plain; charset=utf-8'
  };
  stream.respondWithFD(fd, headers);
  stream.on('close', () => fs.closeSync(fd));
}); 拷贝

可以指定可选的 options.statCheck 函数，让用户代码有机会根据给定文件描述符的 fs.Stat 详细信息设置其他内容标头。如果提供了 statCheck 函数，则 http2stream.respondWithFD() 方法将执行 fs.fstat() 调用以收集有关提供的文件描述符的详细信息。

¥The optional options.statCheck function may be specified to give user code an opportunity to set additional content headers based on the fs.Stat details of the given fd. If the statCheck function is provided, the http2stream.respondWithFD() method will perform an fs.fstat() call to collect details on the provided file descriptor.

offset 和 length 选项可用于限制对特定范围子集的响应。例如，这可用于支持 HTTP 范围请求。

¥The offset and length options may be used to limit the response to a specific range subset. This can be used, for instance, to support HTTP Range requests.

文件描述符或 FileHandle 在流关闭时没有关闭，所以一旦不再需要它就需要手动关闭。不支持对多个流同时使用相同的文件描述符，这可能会导致数据丢失。支持在流结束后重新使用文件描述符。

¥The file descriptor or FileHandle is not closed when the stream is closed, so it will need to be closed manually once it is no longer needed. Using the same file descriptor concurrently for multiple streams is not supported and may result in data loss. Re-using a file descriptor after a stream has finished is supported.

当设置了 options.waitForTrailers 选项时，'wantTrailers' 事件将在将要发送的最后一块有效负载数据排队后立即触发。然后可以使用 http2stream.sendTrailers() 方法将尾随标头字段发送到对等方。

¥When the options.waitForTrailers option is set, the 'wantTrailers' event will be emitted immediately after queuing the last chunk of payload data to be sent. The http2stream.sendTrailers() method can then be used to sent trailing header fields to the peer.

当设置了 options.waitForTrailers，则传输完最后的 DATA 帧时，Http2Stream 不会自动关闭。用户代码必须调用 http2stream.sendTrailers() 或 http2stream.close() 来关闭 Http2Stream。

¥When options.waitForTrailers is set, the Http2Stream will not automatically close when the final DATA frame is transmitted. User code must call either http2stream.sendTrailers() or http2stream.close() to close the Http2Stream.

const http2 = require('node:http2');
const fs = require('node:fs');

const server = http2.createServer();
server.on('stream', (stream) => {
  const fd = fs.openSync('/some/file', 'r');

  const stat = fs.fstatSync(fd);
  const headers = {
    'content-length': stat.size,
    'last-modified': stat.mtime.toUTCString(),
    'content-type': 'text/plain; charset=utf-8'
  };
  stream.respondWithFD(fd, headers, { waitForTrailers: true });
  stream.on('wantTrailers', () => {
    stream.sendTrailers({ ABC: 'some value to send' });
  });

  stream.on('close', () => fs.closeSync(fd));
}); 拷贝

http2stream.respondWithFile(path[, headers[, options]])#

• path <string> | <Buffer> | <URL>

• headers <HTTP/2 Headers Object>

• options <Object>

  • statCheck <Function>

  • onError <Function> 在发送前发生错误时调用的回调函数。

    ¥onError <Function> Callback function invoked in the case of an error before send.

  • waitForTrailers <boolean> 当为 true 时，Http2Stream 将在发送完最后的 DATA 帧后触发 'wantTrailers' 事件。

    ¥waitForTrailers <boolean> When true, the Http2Stream will emit the 'wantTrailers' event after the final DATA frame has been sent.

  • offset <number> 开始读取的偏移位置。

    ¥offset <number> The offset position at which to begin reading.

  • length <number> 从文件描述符发送的数据量。

    ¥length <number> The amount of data from the fd to send.

发送普通文件作为响应。path 必须指定常规文件，否则将在 Http2Stream 对象上触发 'error' 事件。

¥Sends a regular file as the response. The path must specify a regular file or an 'error' event will be emitted on the Http2Stream object.

当使用时，Http2Stream 对象的 Duplex 接口会自动关闭。

¥When used, the Http2Stream object's Duplex interface will be closed automatically.

可以指定可选的 options.statCheck 函数，让用户代码有机会根据给定文件的 fs.Stat 详细信息设置其他内容标头：

¥The optional options.statCheck function may be specified to give user code an opportunity to set additional content headers based on the fs.Stat details of the given file:

如果在尝试读取文件数据时发生错误，将使用标准 INTERNAL_ERROR 代码使用 RST_STREAM 帧关闭 Http2Stream。如果定义了 onError 回调，则它将被调用。否则流将被销毁。

¥If an error occurs while attempting to read the file data, the Http2Stream will be closed using an RST_STREAM frame using the standard INTERNAL_ERROR code. If the onError callback is defined, then it will be called. Otherwise the stream will be destroyed.

使用文件路径的示例：

¥Example using a file path:

const http2 = require('node:http2');
const server = http2.createServer();
server.on('stream', (stream) => {
  function statCheck(stat, headers) {
    headers['last-modified'] = stat.mtime.toUTCString();
  }

  function onError(err) {
    // stream.respond() can throw if the stream has been destroyed by
    // the other side.
    try {
      if (err.code === 'ENOENT') {
        stream.respond({ ':status': 404 });
      } else {
        stream.respond({ ':status': 500 });
      }
    } catch (err) {
      // Perform actual error handling.
      console.log(err);
    }
    stream.end();
  }

  stream.respondWithFile('/some/file',
                         { 'content-type': 'text/plain; charset=utf-8' },
                         { statCheck, onError });
}); 拷贝

options.statCheck 函数也可以通过返回 false 来取消发送操作。例如，条件请求可能会检查统计结果以确定文件是否已被修改以返回适当的 304 响应：

¥The options.statCheck function may also be used to cancel the send operation by returning false. For instance, a conditional request may check the stat results to determine if the file has been modified to return an appropriate 304 response:

const http2 = require('node:http2');
const server = http2.createServer();
server.on('stream', (stream) => {
  function statCheck(stat, headers) {
    // Check the stat here...
    stream.respond({ ':status': 304 });
    return false; // Cancel the send operation
  }
  stream.respondWithFile('/some/file',
                         { 'content-type': 'text/plain; charset=utf-8' },
                         { statCheck });
}); 拷贝

将自动设置 content-length 标头字段。

¥The content-length header field will be automatically set.

offset 和 length 选项可用于限制对特定范围子集的响应。例如，这可用于支持 HTTP 范围请求。

¥The offset and length options may be used to limit the response to a specific range subset. This can be used, for instance, to support HTTP Range requests.

options.onError 函数也可用于处理在启动文件传递之前可能发生的所有错误。默认行为是销毁流。

¥The options.onError function may also be used to handle all the errors that could happen before the delivery of the file is initiated. The default behavior is to destroy the stream.

当设置了 options.waitForTrailers 选项时，'wantTrailers' 事件将在将要发送的最后一块有效负载数据排队后立即触发。然后可以使用 http2stream.sendTrailers() 方法将尾随标头字段发送到对等方。

¥When the options.waitForTrailers option is set, the 'wantTrailers' event will be emitted immediately after queuing the last chunk of payload data to be sent. The http2stream.sendTrailers() method can then be used to sent trailing header fields to the peer.

当设置了 options.waitForTrailers，则传输完最后的 DATA 帧时，Http2Stream 不会自动关闭。用户代码必须调用 http2stream.sendTrailers() 或 http2stream.close() 来关闭 Http2Stream。

¥When options.waitForTrailers is set, the Http2Stream will not automatically close when the final DATA frame is transmitted. User code must call either http2stream.sendTrailers() or http2stream.close() to close the Http2Stream.

const http2 = require('node:http2');
const server = http2.createServer();
server.on('stream', (stream) => {
  stream.respondWithFile('/some/file',
                         { 'content-type': 'text/plain; charset=utf-8' },
                         { waitForTrailers: true });
  stream.on('wantTrailers', () => {
    stream.sendTrailers({ ABC: 'some value to send' });
  });
}); 拷贝

类：Http2Server#

¥Class: Http2Server

• 继承：<net.Server>

  ¥Extends: <net.Server>

Http2Server 的实例是使用 http2.createServer() 函数创建的。Http2Server 类不是由 node:http2 模块直接导出的。

¥Instances of Http2Server are created using the http2.createServer() function. The Http2Server class is not exported directly by the node:http2 module.

事件：'checkContinue'#

¥Event: 'checkContinue'

• request <http2.Http2ServerRequest>

• response <http2.Http2ServerResponse>

如果注册了 'request' 监听器或为 http2.createServer() 提供了回调函数，则每次收到带有 HTTP Expect: 100-continue 的请求时都会触发 'checkContinue' 事件。如果没有监听此事件，则服务器会自动响应状态为 100 Continue。

¥If a 'request' listener is registered or http2.createServer() is supplied a callback function, the 'checkContinue' event is emitted each time a request with an HTTP Expect: 100-continue is received. If this event is not listened for, the server will automatically respond with a status 100 Continue as appropriate.

如果客户端应该继续发送请求正文，则处理此事件涉及调用 response.writeContinue()，或者如果客户端不应该继续发送请求正文，则生成适当的 HTTP 响应（例如 400 Bad Request）。

¥Handling this event involves calling response.writeContinue() if the client should continue to send the request body, or generating an appropriate HTTP response (e.g. 400 Bad Request) if the client should not continue to send the request body.

处理和处理此事件时，不会触发 'request' 事件。

¥When this event is emitted and handled, the 'request' event will not be emitted.

事件：'connection'#

¥Event: 'connection'

• socket <stream.Duplex>

当建立新的 TCP 流时会触发此事件。socket 通常是 net.Socket 类型的对象。通常用户不会想访问这个事件。

¥This event is emitted when a new TCP stream is established. socket is typically an object of type net.Socket. Usually users will not want to access this event.

此事件也可以由用户显式触发，以将连接注入 HTTP 服务器。在这种情况下，任何 Duplex 流都可以通过。

¥This event can also be explicitly emitted by users to inject connections into the HTTP server. In that case, any Duplex stream can be passed.

事件：'request'#

¥Event: 'request'

• request <http2.Http2ServerRequest>

• response <http2.Http2ServerResponse>

每次有请求时触发。每个会话可能有多个请求。参见 兼容性接口。

¥Emitted each time there is a request. There may be multiple requests per session. See the Compatibility API.

事件：'session'#

¥Event: 'session'

• session <ServerHttp2Session>

当 Http2Server 创建新的 Http2Session 时，则会触发 'session' 事件。

¥The 'session' event is emitted when a new Http2Session is created by the Http2Server.

事件：'sessionError'#

¥Event: 'sessionError'

• error <Error>

• session <ServerHttp2Session>

当与 Http2Server 关联的 Http2Session 对象触发 'error' 事件时，则将触发 'sessionError' 事件。

¥The 'sessionError' event is emitted when an 'error' event is emitted by an Http2Session object associated with the Http2Server.

事件：'stream'#

¥Event: 'stream'

• stream <Http2Stream> 对流的引用

  ¥stream <Http2Stream> A reference to the stream

• headers <HTTP/2 Headers Object> 描述标头的对象

  ¥headers <HTTP/2 Headers Object> An object describing the headers

• flags <number> 相关的数字标志

  ¥flags <number> The associated numeric flags

• rawHeaders <Array> 包含原始标头名称后跟它们各自值的数组。

  ¥rawHeaders <Array> An array containing the raw header names followed by their respective values.

当与服务器关联的 Http2Session 触发 'stream' 事件时，则将触发 'stream' 事件。

¥The 'stream' event is emitted when a 'stream' event has been emitted by an Http2Session associated with the server.

另见 Http2Session 的 'stream' 事件。

¥See also Http2Session's 'stream' event.

const http2 = require('node:http2');
const {
  HTTP2_HEADER_METHOD,
  HTTP2_HEADER_PATH,
  HTTP2_HEADER_STATUS,
  HTTP2_HEADER_CONTENT_TYPE
} = http2.constants;

const server = http2.createServer();
server.on('stream', (stream, headers, flags) => {
  const method = headers[HTTP2_HEADER_METHOD];
  const path = headers[HTTP2_HEADER_PATH];
  // ...
  stream.respond({
    [HTTP2_HEADER_STATUS]: 200,
    [HTTP2_HEADER_CONTENT_TYPE]: 'text/plain; charset=utf-8'
  });
  stream.write('hello ');
  stream.end('world');
}); 拷贝

事件：'timeout'#

¥Event: 'timeout'

当服务器上在使用 http2server.setTimeout() 设置的给定毫秒数内没有活动时，则会触发 'timeout' 事件。默认值：0（无超时）

¥The 'timeout' event is emitted when there is no activity on the Server for a given number of milliseconds set using http2server.setTimeout(). Default: 0 (no timeout)

server.close([callback])#

• callback <Function>

停止服务器建立新会话。由于 HTTP/2 会话的持久性，这不会阻止创建新的请求流。要正常地关闭服务器，则在所有活动会话上调用 http2session.close()。

¥Stops the server from establishing new sessions. This does not prevent new request streams from being created due to the persistent nature of HTTP/2 sessions. To gracefully shut down the server, call http2session.close() on all active sessions.

如果提供了 callback，则在所有活动会话都关闭之前不会调用它，尽管服务器已经停止允许新会话。有关详细信息，请参阅 net.Server.close()。

¥If callback is provided, it is not invoked until all active sessions have been closed, although the server has already stopped allowing new sessions. See net.Server.close() for more details.

server.setTimeout([msecs][, callback])#

• msecs <number> 默认值：0（无超时）

  ¥msecs <number> Default: 0 (no timeout)

• callback <Function>

• 返回：<Http2Server>

  ¥Returns: <Http2Server>

用于设置 http2 服务器请求的超时值，设置 msecs 毫秒后 Http2Server 上没有活动时调用的回调函数。

¥Used to set the timeout value for http2 server requests, and sets a callback function that is called when there is no activity on the Http2Server after msecs milliseconds.

给定的回调已注册为 'timeout' 事件的监听器。

¥The given callback is registered as a listener on the 'timeout' event.

如果 callback 不是函数，则会抛出新的 ERR_INVALID_CALLBACK 错误。

¥In case if callback is not a function, a new ERR_INVALID_CALLBACK error will be thrown.

server.timeout#

• <number> 超时（以毫秒为单位）。默认值：0（无超时）

  ¥<number> Timeout in milliseconds. Default: 0 (no timeout)

假定套接字超时之前不活动的毫秒数。

¥The number of milliseconds of inactivity before a socket is presumed to have timed out.

值 0 将禁用传入连接的超时行为。

¥A value of 0 will disable the timeout behavior on incoming connections.

套接字超时逻辑是在连接上设置的，因此更改此值只会影响到服务器的新连接，而不会影响任何现有连接。

¥The socket timeout logic is set up on connection, so changing this value only affects new connections to the server, not any existing connections.

server.updateSettings([settings])#

• settings <HTTP/2 Settings Object>

用于使用提供的设置更新服务器。

¥Used to update the server with the provided settings.

为无效的 settings 值抛出 ERR_HTTP2_INVALID_SETTING_VALUE。

¥Throws ERR_HTTP2_INVALID_SETTING_VALUE for invalid settings values.

为无效的 settings 参数抛出 ERR_INVALID_ARG_TYPE。

¥Throws ERR_INVALID_ARG_TYPE for invalid settings argument.

类：Http2SecureServer#

¥Class: Http2SecureServer

• 继承：<tls.Server>

  ¥Extends: <tls.Server>

Http2SecureServer 的实例是使用 http2.createSecureServer() 函数创建的。Http2SecureServer 类不是由 node:http2 模块直接导出的。

¥Instances of Http2SecureServer are created using the http2.createSecureServer() function. The Http2SecureServer class is not exported directly by the node:http2 module.

事件：'checkContinue'#

¥Event: 'checkContinue'

• request <http2.Http2ServerRequest>

• response <http2.Http2ServerResponse>

如果注册了 'request' 监听器或为 http2.createSecureServer() 提供了回调函数，则每次收到带有 HTTP Expect: 100-continue 的请求时都会触发 'checkContinue' 事件。如果没有监听此事件，则服务器会自动响应状态为 100 Continue。

¥If a 'request' listener is registered or http2.createSecureServer() is supplied a callback function, the 'checkContinue' event is emitted each time a request with an HTTP Expect: 100-continue is received. If this event is not listened for, the server will automatically respond with a status 100 Continue as appropriate.

如果客户端应该继续发送请求正文，则处理此事件涉及调用 response.writeContinue()，或者如果客户端不应该继续发送请求正文，则生成适当的 HTTP 响应（例如 400 Bad Request）。

¥Handling this event involves calling response.writeContinue() if the client should continue to send the request body, or generating an appropriate HTTP response (e.g. 400 Bad Request) if the client should not continue to send the request body.

处理和处理此事件时，不会触发 'request' 事件。

¥When this event is emitted and handled, the 'request' event will not be emitted.

事件：'connection'#

¥Event: 'connection'

• socket <stream.Duplex>

此事件在建立新的 TCP 流时触发，在 TLS 握手开始之前。socket 通常是 net.Socket 类型的对象。通常用户不会想访问这个事件。

¥This event is emitted when a new TCP stream is established, before the TLS handshake begins. socket is typically an object of type net.Socket. Usually users will not want to access this event.

此事件也可以由用户显式触发，以将连接注入 HTTP 服务器。在这种情况下，任何 Duplex 流都可以通过。

¥This event can also be explicitly emitted by users to inject connections into the HTTP server. In that case, any Duplex stream can be passed.

事件：'request'#

¥Event: 'request'

• request <http2.Http2ServerRequest>

• response <http2.Http2ServerResponse>

每次有请求时触发。每个会话可能有多个请求。参见 兼容性接口。

¥Emitted each time there is a request. There may be multiple requests per session. See the Compatibility API.

事件：'session'#

¥Event: 'session'

• session <ServerHttp2Session>

当 Http2SecureServer 创建新的 Http2Session 时，则会触发 'session' 事件。

¥The 'session' event is emitted when a new Http2Session is created by the Http2SecureServer.

事件：'sessionError'#

¥Event: 'sessionError'

• error <Error>

• session <ServerHttp2Session>

当与 Http2SecureServer 关联的 Http2Session 对象触发 'error' 事件时，则将触发 'sessionError' 事件。

¥The 'sessionError' event is emitted when an 'error' event is emitted by an Http2Session object associated with the Http2SecureServer.

事件：'stream'#

¥Event: 'stream'

• stream <Http2Stream> 对流的引用

  ¥stream <Http2Stream> A reference to the stream

• headers <HTTP/2 Headers Object> 描述标头的对象

  ¥headers <HTTP/2 Headers Object> An object describing the headers

• flags <number> 相关的数字标志

  ¥flags <number> The associated numeric flags

• rawHeaders <Array> 包含原始标头名称后跟它们各自值的数组。

  ¥rawHeaders <Array> An array containing the raw header names followed by their respective values.

当与服务器关联的 Http2Session 触发 'stream' 事件时，则将触发 'stream' 事件。

¥The 'stream' event is emitted when a 'stream' event has been emitted by an Http2Session associated with the server.

另见 Http2Session 的 'stream' 事件。

¥See also Http2Session's 'stream' event.

const http2 = require('node:http2');
const {
  HTTP2_HEADER_METHOD,
  HTTP2_HEADER_PATH,
  HTTP2_HEADER_STATUS,
  HTTP2_HEADER_CONTENT_TYPE
} = http2.constants;

const options = getOptionsSomehow();

const server = http2.createSecureServer(options);
server.on('stream', (stream, headers, flags) => {
  const method = headers[HTTP2_HEADER_METHOD];
  const path = headers[HTTP2_HEADER_PATH];
  // ...
  stream.respond({
    [HTTP2_HEADER_STATUS]: 200,
    [HTTP2_HEADER_CONTENT_TYPE]: 'text/plain; charset=utf-8'
  });
  stream.write('hello ');
  stream.end('world');
}); 拷贝

事件：'timeout'#

¥Event: 'timeout'

当服务器上在使用 http2secureServer.setTimeout() 设置的给定毫秒数内没有活动时，则会触发 'timeout' 事件。默认值：2 分钟。

¥The 'timeout' event is emitted when there is no activity on the Server for a given number of milliseconds set using http2secureServer.setTimeout(). Default: 2 minutes.

事件：'unknownProtocol'#

¥Event: 'unknownProtocol'

• socket <stream.Duplex>

当连接的客户端无法协商允许的协议（即 HTTP/2 或 HTTP/1.1）时，则会触发 'unknownProtocol' 事件。事件句柄接收套接字进行处理。如果没有为该事件注册监听器，则连接将终止。可以使用传给 http2.createSecureServer() 的 'unknownProtocolTimeout' 选项指定超时。参见 兼容性接口。

¥The 'unknownProtocol' event is emitted when a connecting client fails to negotiate an allowed protocol (i.e. HTTP/2 or HTTP/1.1). The event handler receives the socket for handling. If no listener is registered for this event, the connection is terminated. A timeout may be specified using the 'unknownProtocolTimeout' option passed to http2.createSecureServer(). See the Compatibility API.

server.close([callback])#

• callback <Function>

停止服务器建立新会话。由于 HTTP/2 会话的持久性，这不会阻止创建新的请求流。要正常地关闭服务器，则在所有活动会话上调用 http2session.close()。

¥Stops the server from establishing new sessions. This does not prevent new request streams from being created due to the persistent nature of HTTP/2 sessions. To gracefully shut down the server, call http2session.close() on all active sessions.

如果提供了 callback，则在所有活动会话都关闭之前不会调用它，尽管服务器已经停止允许新会话。有关详细信息，请参阅 tls.Server.close()。

¥If callback is provided, it is not invoked until all active sessions have been closed, although the server has already stopped allowing new sessions. See tls.Server.close() for more details.

server.setTimeout([msecs][, callback])#

• msecs <number> 默认值：120000（2 分钟）

  ¥msecs <number> Default: 120000 (2 minutes)

• callback <Function>

• 返回：<Http2SecureServer>

  ¥Returns: <Http2SecureServer>

用于设置 http2 安全服务器请求的超时值，设置 msecs 毫秒后 Http2SecureServer 上没有活动时调用的回调函数。

¥Used to set the timeout value for http2 secure server requests, and sets a callback function that is called when there is no activity on the Http2SecureServer after msecs milliseconds.

给定的回调已注册为 'timeout' 事件的监听器。

¥The given callback is registered as a listener on the 'timeout' event.

如果 callback 不是函数，则会抛出新的 ERR_INVALID_CALLBACK 错误。

¥In case if callback is not a function, a new ERR_INVALID_CALLBACK error will be thrown.

server.timeout#

• <number> 超时（以毫秒为单位）。默认值：0（无超时）

  ¥<number> Timeout in milliseconds. Default: 0 (no timeout)

假定套接字超时之前不活动的毫秒数。

¥The number of milliseconds of inactivity before a socket is presumed to have timed out.

值 0 将禁用传入连接的超时行为。

¥A value of 0 will disable the timeout behavior on incoming connections.

套接字超时逻辑是在连接上设置的，因此更改此值只会影响到服务器的新连接，而不会影响任何现有连接。

¥The socket timeout logic is set up on connection, so changing this value only affects new connections to the server, not any existing connections.

server.updateSettings([settings])#

• settings <HTTP/2 Settings Object>

用于使用提供的设置更新服务器。

¥Used to update the server with the provided settings.

为无效的 settings 值抛出 ERR_HTTP2_INVALID_SETTING_VALUE。

¥Throws ERR_HTTP2_INVALID_SETTING_VALUE for invalid settings values.

为无效的 settings 参数抛出 ERR_INVALID_ARG_TYPE。

¥Throws ERR_INVALID_ARG_TYPE for invalid settings argument.

http2.createServer([options][, onRequestHandler])#

• options <Object>

  • maxDeflateDynamicTableSize <number> 设置用于压缩标头字段的最大动态表大小。默认值：4Kib。

    ¥maxDeflateDynamicTableSize <number> Sets the maximum dynamic table size for deflating header fields. Default: 4Kib.

  • maxSettings <number> 设置每 SETTINGS 帧的最大设置条目数。允许的最小值为 1。默认值：32。

    ¥maxSettings <number> Sets the maximum number of settings entries per SETTINGS frame. The minimum value allowed is 1. Default: 32.

  • maxSessionMemory <number> 设置允许 Http2Session 使用的最大内存。该值以兆字节数表示，例如 1 等于 1 兆字节。允许的最小值为 1。这是一个基于信用的限制，现有的 Http2Stream 可能会导致超过此限制，但新的 Http2Stream 实例将在超过此限制时被拒绝。当前 Http2Stream 会话数、标头压缩表的当前内存使用、当前排队等待发送的数据以及未确认的 PING 和 SETTINGS 帧都计入当前限制。默认值：10。

    ¥maxSessionMemory<number> Sets the maximum memory that the Http2Session is permitted to use. The value is expressed in terms of number of megabytes, e.g. 1 equal 1 megabyte. The minimum value allowed is 1. This is a credit based limit, existing Http2Streams may cause this limit to be exceeded, but new Http2Stream instances will be rejected while this limit is exceeded. The current number of Http2Stream sessions, the current memory use of the header compression tables, current data queued to be sent, and unacknowledged PING and SETTINGS frames are all counted towards the current limit. Default: 10.

  • maxHeaderListPairs <number> 设置标头条目的最大数量。这类似于 node:http 模块中的 server.maxHeadersCount 或 request.maxHeadersCount。最小值为 4。默认值：128。

    ¥maxHeaderListPairs <number> Sets the maximum number of header entries. This is similar to server.maxHeadersCount or request.maxHeadersCount in the node:http module. The minimum value is 4. Default: 128.

  • maxOutstandingPings <number> 设置未确认的未确认 ping 的最大数量。默认值：10。

    ¥maxOutstandingPings <number> Sets the maximum number of outstanding, unacknowledged pings. Default: 10.

  • maxSendHeaderBlockLength <number> 设置序列化的、压缩的标头块的最大允许大小。尝试发送超出此限制的标头将导致触发 'frameError' 事件并且流被关闭和销毁。虽然这将最大允许大小设置为整个标头块，但 nghttp2（内部 http2 库）对每个解压缩的键/值对都有 65536 的限制。

    ¥maxSendHeaderBlockLength <number> Sets the maximum allowed size for a serialized, compressed block of headers. Attempts to send headers that exceed this limit will result in a 'frameError' event being emitted and the stream being closed and destroyed. While this sets the maximum allowed size to the entire block of headers, nghttp2 (the internal http2 library) has a limit of 65536 for each decompressed key/value pair.

  • paddingStrategy <number> 用于确定用于 HEADERS 和 DATA 帧的填充量的策略。默认值：http2.constants.PADDING_STRATEGY_NONE。值可能是以下之一：

    ¥paddingStrategy <number> The strategy used for determining the amount of padding to use for HEADERS and DATA frames. Default: http2.constants.PADDING_STRATEGY_NONE. Value may be one of:

    • http2.constants.PADDING_STRATEGY_NONE：没有应用填充。

      ¥http2.constants.PADDING_STRATEGY_NONE: No padding is applied.

    • http2.constants.PADDING_STRATEGY_MAX：应用由内部实现决定的最大填充量。

      ¥http2.constants.PADDING_STRATEGY_MAX: The maximum amount of padding, determined by the internal implementation, is applied.

    • http2.constants.PADDING_STRATEGY_ALIGNED：尝试应用足够的填充以确保包括 9 字节标头在内的总帧长度是 8 的倍数。对于每一帧，有一个由当前流控制状态和设置决定的最大允许填充字节数。如果此最大值小于确保对齐所需的计算量，则使用最大值，并且总帧长度不一定按 8 字节对齐。

      ¥http2.constants.PADDING_STRATEGY_ALIGNED: Attempts to apply enough padding to ensure that the total frame length, including the 9-byte header, is a multiple of 8. For each frame, there is a maximum allowed number of padding bytes that is determined by current flow control state and settings. If this maximum is less than the calculated amount needed to ensure alignment, the maximum is used and the total frame length is not necessarily aligned at 8 bytes.

  • peerMaxConcurrentStreams <number> 设置远程对等方的最大并发流数，就好像已收到 SETTINGS 帧一样。如果远程对等方为 maxConcurrentStreams 设置了自己的值，则将被覆盖。默认值：100。

    ¥peerMaxConcurrentStreams <number> Sets the maximum number of concurrent streams for the remote peer as if a SETTINGS frame had been received. Will be overridden if the remote peer sets its own value for maxConcurrentStreams. Default: 100.

  • maxSessionInvalidFrames <integer> 设置会话关闭前允许的最大无效帧数。默认值：1000。

    ¥maxSessionInvalidFrames <integer> Sets the maximum number of invalid frames that will be tolerated before the session is closed. Default: 1000.

  • maxSessionRejectedStreams <integer> 设置会话关闭前允许的创建流拒绝的最大数量。每个拒绝都与 NGHTTP2_ENHANCE_YOUR_CALM 错误相关联，该错误应该告诉对等方不要再打开任何流，因此继续打开流被视为行为不端的对等方的标志。默认值：100。

    ¥maxSessionRejectedStreams <integer> Sets the maximum number of rejected upon creation streams that will be tolerated before the session is closed. Each rejection is associated with an NGHTTP2_ENHANCE_YOUR_CALM error that should tell the peer to not open any more streams, continuing to open streams is therefore regarded as a sign of a misbehaving peer. Default: 100.

  • settings <HTTP/2 Settings Object> 连接时发送到远程对等方的初始设置。

    ¥settings <HTTP/2 Settings Object> The initial settings to send to the remote peer upon connection.

  • Http1IncomingMessage <http.IncomingMessage> 指定用于 HTTP/1 回退的 IncomingMessage 类。用于扩展原始的 http.IncomingMessage。默认值：http.IncomingMessage。

    ¥Http1IncomingMessage <http.IncomingMessage> Specifies the IncomingMessage class to used for HTTP/1 fallback. Useful for extending the original http.IncomingMessage. Default: http.IncomingMessage.

  • Http1ServerResponse <http.ServerResponse> 指定用于 HTTP/1 回退的 ServerResponse 类。用于扩展原始的 http.ServerResponse。默认值：http.ServerResponse。

    ¥Http1ServerResponse <http.ServerResponse> Specifies the ServerResponse class to used for HTTP/1 fallback. Useful for extending the original http.ServerResponse. Default: http.ServerResponse.

  • Http2ServerRequest <http2.Http2ServerRequest> 指定要使用的 Http2ServerRequest 类。用于扩展原始的 Http2ServerRequest。默认值：Http2ServerRequest。

    ¥Http2ServerRequest <http2.Http2ServerRequest> Specifies the Http2ServerRequest class to use. Useful for extending the original Http2ServerRequest. Default: Http2ServerRequest.

  • Http2ServerResponse <http2.Http2ServerResponse> 指定要使用的 Http2ServerResponse 类。用于扩展原始的 Http2ServerResponse。默认值：Http2ServerResponse。

    ¥Http2ServerResponse <http2.Http2ServerResponse> Specifies the Http2ServerResponse class to use. Useful for extending the original Http2ServerResponse. Default: Http2ServerResponse.

  • unknownProtocolTimeout <number> 指定在触发 'unknownProtocol' 时服务器应等待的超时（以毫秒为单位）。如果到那时套接字还没有被销毁，则服务器将销毁它。默认值：10000。

    ¥unknownProtocolTimeout <number> Specifies a timeout in milliseconds that a server should wait when an 'unknownProtocol' is emitted. If the socket has not been destroyed by that time the server will destroy it. Default: 10000.

  • ...:可以提供任何 net.createServer() 选项。

    ¥...: Any net.createServer() option can be provided.

• onRequestHandler <Function> 参见 兼容性接口

  ¥onRequestHandler <Function> See Compatibility API

• 返回：<Http2Server>

  ¥Returns: <Http2Server>

返回创建和管理 Http2Session 实例的 net.Server 实例。

¥Returns a net.Server instance that creates and manages Http2Session instances.

由于没有已知的浏览器支持 未加密的 HTTP/2，因此在与浏览器客户端通信时必须使用 http2.createSecureServer()。

¥Since there are no browsers known that support unencrypted HTTP/2, the use of http2.createSecureServer() is necessary when communicating with browser clients.

const http2 = require('node:http2');

// Create an unencrypted HTTP/2 server.
// Since there are no browsers known that support
// unencrypted HTTP/2, the use of `http2.createSecureServer()`
// is necessary when communicating with browser clients.
const server = http2.createServer();

server.on('stream', (stream, headers) => {
  stream.respond({
    'content-type': 'text/html; charset=utf-8',
    ':status': 200
  });
  stream.end('<h1>Hello World</h1>');
});

server.listen(80); 拷贝

http2.createSecureServer(options[, onRequestHandler])#

• options <Object>

  • allowHTTP1 <boolean> 当设置为 true 时，不支持 HTTP/2 的传入客户端连接将降级为 HTTP/1.x。参见 'unknownProtocol' 事件。参见 ALPN 协商。默认值：false。

    ¥allowHTTP1 <boolean> Incoming client connections that do not support HTTP/2 will be downgraded to HTTP/1.x when set to true. See the 'unknownProtocol' event. See ALPN negotiation. Default: false.

  • maxDeflateDynamicTableSize <number> 设置用于压缩标头字段的最大动态表大小。默认值：4Kib。

    ¥maxDeflateDynamicTableSize <number> Sets the maximum dynamic table size for deflating header fields. Default: 4Kib.

  • maxSettings <number> 设置每 SETTINGS 帧的最大设置条目数。允许的最小值为 1。默认值：32。

    ¥maxSettings <number> Sets the maximum number of settings entries per SETTINGS frame. The minimum value allowed is 1. Default: 32.

  • maxSessionMemory <number> 设置允许 Http2Session 使用的最大内存。该值以兆字节数表示，例如 1 等于 1 兆字节。允许的最小值为 1。这是一个基于信用的限制，现有的 Http2Stream 可能会导致超过此限制，但新的 Http2Stream 实例将在超过此限制时被拒绝。当前 Http2Stream 会话数、标头压缩表的当前内存使用、当前排队等待发送的数据以及未确认的 PING 和 SETTINGS 帧都计入当前限制。默认值：10。

    ¥maxSessionMemory<number> Sets the maximum memory that the Http2Session is permitted to use. The value is expressed in terms of number of megabytes, e.g. 1 equal 1 megabyte. The minimum value allowed is 1. This is a credit based limit, existing Http2Streams may cause this limit to be exceeded, but new Http2Stream instances will be rejected while this limit is exceeded. The current number of Http2Stream sessions, the current memory use of the header compression tables, current data queued to be sent, and unacknowledged PING and SETTINGS frames are all counted towards the current limit. Default: 10.

  • maxHeaderListPairs <number> 设置标头条目的最大数量。这类似于 node:http 模块中的 server.maxHeadersCount 或 request.maxHeadersCount。最小值为 4。默认值：128。

    ¥maxHeaderListPairs <number> Sets the maximum number of header entries. This is similar to server.maxHeadersCount or request.maxHeadersCount in the node:http module. The minimum value is 4. Default: 128.

  • maxOutstandingPings <number> 设置未确认的未确认 ping 的最大数量。默认值：10。

    ¥maxOutstandingPings <number> Sets the maximum number of outstanding, unacknowledged pings. Default: 10.

  • maxSendHeaderBlockLength <number> 设置序列化的、压缩的标头块的最大允许大小。尝试发送超出此限制的标头将导致触发 'frameError' 事件并且流被关闭和销毁。

    ¥maxSendHeaderBlockLength <number> Sets the maximum allowed size for a serialized, compressed block of headers. Attempts to send headers that exceed this limit will result in a 'frameError' event being emitted and the stream being closed and destroyed.

  • paddingStrategy <number> 用于确定用于 HEADERS 和 DATA 帧的填充量的策略。默认值：http2.constants.PADDING_STRATEGY_NONE。值可能是以下之一：

    ¥paddingStrategy <number> Strategy used for determining the amount of padding to use for HEADERS and DATA frames. Default: http2.constants.PADDING_STRATEGY_NONE. Value may be one of:

    • http2.constants.PADDING_STRATEGY_NONE：没有应用填充。

      ¥http2.constants.PADDING_STRATEGY_NONE: No padding is applied.

    • http2.constants.PADDING_STRATEGY_MAX：应用由内部实现决定的最大填充量。

      ¥http2.constants.PADDING_STRATEGY_MAX: The maximum amount of padding, determined by the internal implementation, is applied.

    • http2.constants.PADDING_STRATEGY_ALIGNED：尝试应用足够的填充以确保包括 9 字节标头在内的总帧长度是 8 的倍数。对于每一帧，有一个由当前流控制状态和设置决定的最大允许填充字节数。如果此最大值小于确保对齐所需的计算量，则使用最大值，并且总帧长度不一定按 8 字节对齐。

      ¥http2.constants.PADDING_STRATEGY_ALIGNED: Attempts to apply enough padding to ensure that the total frame length, including the 9-byte header, is a multiple of 8. For each frame, there is a maximum allowed number of padding bytes that is determined by current flow control state and settings. If this maximum is less than the calculated amount needed to ensure alignment, the maximum is used and the total frame length is not necessarily aligned at 8 bytes.

  • peerMaxConcurrentStreams <number> 设置远程对等方的最大并发流数，就好像已收到 SETTINGS 帧一样。如果远程对等方为 maxConcurrentStreams 设置了自己的值，则将被覆盖。默认值：100。

    ¥peerMaxConcurrentStreams <number> Sets the maximum number of concurrent streams for the remote peer as if a SETTINGS frame had been received. Will be overridden if the remote peer sets its own value for maxConcurrentStreams. Default: 100.

  • maxSessionInvalidFrames <integer> 设置会话关闭前允许的最大无效帧数。默认值：1000。

    ¥maxSessionInvalidFrames <integer> Sets the maximum number of invalid frames that will be tolerated before the session is closed. Default: 1000.

  • maxSessionRejectedStreams <integer> 设置会话关闭前允许的创建流拒绝的最大数量。每个拒绝都与 NGHTTP2_ENHANCE_YOUR_CALM 错误相关联，该错误应该告诉对等方不要再打开任何流，因此继续打开流被视为行为不端的对等方的标志。默认值：100。

    ¥maxSessionRejectedStreams <integer> Sets the maximum number of rejected upon creation streams that will be tolerated before the session is closed. Each rejection is associated with an NGHTTP2_ENHANCE_YOUR_CALM error that should tell the peer to not open any more streams, continuing to open streams is therefore regarded as a sign of a misbehaving peer. Default: 100.

  • settings <HTTP/2 Settings Object> 连接时发送到远程对等方的初始设置。

    ¥settings <HTTP/2 Settings Object> The initial settings to send to the remote peer upon connection.

  • ...:可以提供任何 tls.createServer() 选项。对于服务器，通常需要身份选项（pfx 或 key/cert）。

    ¥...: Any tls.createServer() options can be provided. For servers, the identity options (pfx or key/cert) are usually required.

  • origins <string[]> 在创建新服务器 Http2Session 后立即在 ORIGIN 帧内发送的原始字符串数组。

    ¥origins <string[]> An array of origin strings to send within an ORIGIN frame immediately following creation of a new server Http2Session.

  • unknownProtocolTimeout <number> 指定在触发 'unknownProtocol' 事件时服务器应等待的超时（以毫秒为单位）。如果到那时套接字还没有被销毁，则服务器将销毁它。默认值：10000。

    ¥unknownProtocolTimeout <number> Specifies a timeout in milliseconds that a server should wait when an 'unknownProtocol' event is emitted. If the socket has not been destroyed by that time the server will destroy it. Default: 10000.

• onRequestHandler <Function> 参见 兼容性接口

  ¥onRequestHandler <Function> See Compatibility API

• 返回：<Http2SecureServer>

  ¥Returns: <Http2SecureServer>

返回创建和管理 Http2Session 实例的 tls.Server 实例。

¥Returns a tls.Server instance that creates and manages Http2Session instances.

const http2 = require('node:http2');
const fs = require('node:fs');

const options = {
  key: fs.readFileSync('server-key.pem'),
  cert: fs.readFileSync('server-cert.pem')
};

// Create a secure HTTP/2 server
const server = http2.createSecureServer(options);

server.on('stream', (stream, headers) => {
  stream.respond({
    'content-type': 'text/html; charset=utf-8',
    ':status': 200
  });
  stream.end('<h1>Hello World</h1>');
});

server.listen(80); 拷贝

http2.connect(authority[, options][, listener])#

• authority <string> | <URL> 要连接的远程 HTTP/2 服务器。这必须是带有 http:// 或 https:// 前缀、主机名和 IP 端口（如果使用非默认端口）的最小有效 URL 的形式。URL 中的用户信息（用户 ID 和密码）、路径、查询字符串和片段详细信息将被忽略。

  ¥authority <string> | <URL> The remote HTTP/2 server to connect to. This must be in the form of a minimal, valid URL with the http:// or https:// prefix, host name, and IP port (if a non-default port is used). Userinfo (user ID and password), path, querystring, and fragment details in the URL will be ignored.

• options <Object>

  • maxDeflateDynamicTableSize <number> 设置用于压缩标头字段的最大动态表大小。默认值：4Kib。

    ¥maxDeflateDynamicTableSize <number> Sets the maximum dynamic table size for deflating header fields. Default: 4Kib.

  • maxSettings <number> 设置每 SETTINGS 帧的最大设置条目数。允许的最小值为 1。默认值：32。

    ¥maxSettings <number> Sets the maximum number of settings entries per SETTINGS frame. The minimum value allowed is 1. Default: 32.

  • maxSessionMemory <number> 设置允许 Http2Session 使用的最大内存。该值以兆字节数表示，例如 1 等于 1 兆字节。允许的最小值为 1。这是一个基于信用的限制，现有的 Http2Stream 可能会导致超过此限制，但新的 Http2Stream 实例将在超过此限制时被拒绝。当前 Http2Stream 会话数、标头压缩表的当前内存使用、当前排队等待发送的数据以及未确认的 PING 和 SETTINGS 帧都计入当前限制。默认值：10。

    ¥maxSessionMemory<number> Sets the maximum memory that the Http2Session is permitted to use. The value is expressed in terms of number of megabytes, e.g. 1 equal 1 megabyte. The minimum value allowed is 1. This is a credit based limit, existing Http2Streams may cause this limit to be exceeded, but new Http2Stream instances will be rejected while this limit is exceeded. The current number of Http2Stream sessions, the current memory use of the header compression tables, current data queued to be sent, and unacknowledged PING and SETTINGS frames are all counted towards the current limit. Default: 10.

  • maxHeaderListPairs <number> 设置标头条目的最大数量。这类似于 node:http 模块中的 server.maxHeadersCount 或 request.maxHeadersCount。最小值为 1。默认值：128。

    ¥maxHeaderListPairs <number> Sets the maximum number of header entries. This is similar to server.maxHeadersCount or request.maxHeadersCount in the node:http module. The minimum value is 1. Default: 128.

  • maxOutstandingPings <number> 设置未确认的未确认 ping 的最大数量。默认值：10。

    ¥maxOutstandingPings <number> Sets the maximum number of outstanding, unacknowledged pings. Default: 10.

  • maxReservedRemoteStreams <number> 设置客户端在任何给定时间将接受的最大保留推送流数。一旦当前预留的推送流数量超过此限制，则服务器发送的新推送流将被自动拒绝。最小允许值为 0。允许的最大值为 2³²-1。负值将此选项设置为最大允许值。默认值：200。

    ¥maxReservedRemoteStreams <number> Sets the maximum number of reserved push streams the client will accept at any given time. Once the current number of currently reserved push streams exceeds reaches this limit, new push streams sent by the server will be automatically rejected. The minimum allowed value is 0. The maximum allowed value is 2³²-1. A negative value sets this option to the maximum allowed value. Default: 200.

  • maxSendHeaderBlockLength <number> 设置序列化的、压缩的标头块的最大允许大小。尝试发送超出此限制的标头将导致触发 'frameError' 事件并且流被关闭和销毁。

    ¥maxSendHeaderBlockLength <number> Sets the maximum allowed size for a serialized, compressed block of headers. Attempts to send headers that exceed this limit will result in a 'frameError' event being emitted and the stream being closed and destroyed.

  • paddingStrategy <number> 用于确定用于 HEADERS 和 DATA 帧的填充量的策略。默认值：http2.constants.PADDING_STRATEGY_NONE。值可能是以下之一：

    ¥paddingStrategy <number> Strategy used for determining the amount of padding to use for HEADERS and DATA frames. Default: http2.constants.PADDING_STRATEGY_NONE. Value may be one of:

    • http2.constants.PADDING_STRATEGY_NONE：没有应用填充。

      ¥http2.constants.PADDING_STRATEGY_NONE: No padding is applied.

    • http2.constants.PADDING_STRATEGY_MAX：应用由内部实现决定的最大填充量。

      ¥http2.constants.PADDING_STRATEGY_MAX: The maximum amount of padding, determined by the internal implementation, is applied.

    • http2.constants.PADDING_STRATEGY_ALIGNED：尝试应用足够的填充以确保包括 9 字节标头在内的总帧长度是 8 的倍数。对于每一帧，有一个由当前流控制状态和设置决定的最大允许填充字节数。如果此最大值小于确保对齐所需的计算量，则使用最大值，并且总帧长度不一定按 8 字节对齐。

      ¥http2.constants.PADDING_STRATEGY_ALIGNED: Attempts to apply enough padding to ensure that the total frame length, including the 9-byte header, is a multiple of 8. For each frame, there is a maximum allowed number of padding bytes that is determined by current flow control state and settings. If this maximum is less than the calculated amount needed to ensure alignment, the maximum is used and the total frame length is not necessarily aligned at 8 bytes.

  • peerMaxConcurrentStreams <number> 设置远程对等方的最大并发流数，就好像已收到 SETTINGS 帧一样。如果远程对等方为 maxConcurrentStreams 设置了自己的值，则将被覆盖。默认值：100。

    ¥peerMaxConcurrentStreams <number> Sets the maximum number of concurrent streams for the remote peer as if a SETTINGS frame had been received. Will be overridden if the remote peer sets its own value for maxConcurrentStreams. Default: 100.

  • protocol <string> 要连接的协议，如果在 authority 中没有设置。值可以是 'http:' 或 'https:'。默认值：'https:'

    ¥protocol <string> The protocol to connect with, if not set in the authority. Value may be either 'http:' or 'https:'. Default: 'https:'

  • settings <HTTP/2 Settings Object> 连接时发送到远程对等方的初始设置。

    ¥settings <HTTP/2 Settings Object> The initial settings to send to the remote peer upon connection.

  • createConnection <Function> 可选的回调，它接收传给 connect 和 options 对象的 URL 实例，并返回将用作此会话连接的任何 Duplex 流。

    ¥createConnection <Function> An optional callback that receives the URL instance passed to connect and the options object, and returns any Duplex stream that is to be used as the connection for this session.

  • ...:可以提供任何 net.connect() 或 tls.connect() 选项。

    ¥...: Any net.connect() or tls.connect() options can be provided.

  • unknownProtocolTimeout <number> 指定在触发 'unknownProtocol' 事件时服务器应等待的超时（以毫秒为单位）。如果到那时套接字还没有被销毁，则服务器将销毁它。默认值：10000。

    ¥unknownProtocolTimeout <number> Specifies a timeout in milliseconds that a server should wait when an 'unknownProtocol' event is emitted. If the socket has not been destroyed by that time the server will destroy it. Default: 10000.

• listener <Function> 将注册为 'connect' 事件的单次监听器。

  ¥listener <Function> Will be registered as a one-time listener of the 'connect' event.

• 返回：<ClientHttp2Session>

  ¥Returns: <ClientHttp2Session>

返回 ClientHttp2Session 实例。

¥Returns a ClientHttp2Session instance.

const http2 = require('node:http2');
const client = http2.connect('https://localhost:1234');

/* Use the client */

client.close(); 拷贝

http2.constants#

RST_STREAM 和 GOAWAY 的错误代码#

¥Error codes for RST_STREAM and GOAWAY

当服务器上在使用 http2server.setTimeout() 设置的给定毫秒数内没有活动时，则会触发 'timeout' 事件。

¥The 'timeout' event is emitted when there is no activity on the Server for a given number of milliseconds set using http2server.setTimeout().

http2.getDefaultSettings()#

• 返回：<HTTP/2 Settings Object>

  ¥Returns: <HTTP/2 Settings Object>

返回包含 Http2Session 实例默认设置的对象。此方法每次调用时都会返回新的对象实例，因此可以安全地修改返回的实例以供使用。

¥Returns an object containing the default settings for an Http2Session instance. This method returns a new object instance every time it is called so instances returned may be safely modified for use.

http2.getPackedSettings([settings])#

• settings <HTTP/2 Settings Object>

• 返回：<Buffer>

  ¥Returns: <Buffer>

返回一个 Buffer 实例，其中包含 HTTP/2 规范中指定的给定 HTTP/2 设置的序列化表示。这旨在与 HTTP2-Settings 标头字段一起使用。

¥Returns a Buffer instance containing serialized representation of the given HTTP/2 settings as specified in the HTTP/2 specification. This is intended for use with the HTTP2-Settings header field.

const http2 = require('node:http2');

const packed = http2.getPackedSettings({ enablePush: false });

console.log(packed.toString('base64'));
// Prints: AAIAAAAA 拷贝

http2.getUnpackedSettings(buf)#

• buf <Buffer> | <TypedArray> 打包的设置。

  ¥buf <Buffer> | <TypedArray> The packed settings.

• 返回：<HTTP/2 Settings Object>

  ¥Returns: <HTTP/2 Settings Object>

返回 HTTP/2 设置对象，其中包含由 http2.getPackedSettings() 生成的给定 Buffer 的反序列化设置。

¥Returns a HTTP/2 Settings Object containing the deserialized settings from the given Buffer as generated by http2.getPackedSettings().

http2.sensitiveHeaders#

• <symbol>

可以将此符号设置为 HTTP/2 标头对象上的属性，并带有一个数组值，以提供被视为敏感的标头列表。有关详细信息，请参阅 敏感标头。

¥This symbol can be set as a property on the HTTP/2 headers object with an array value in order to provide a list of headers considered sensitive. See Sensitive headers for more details.

标头对象#

¥Headers object

标头在 JavaScript 对象上表示为自有的属性。属性键将被序列化为小写。属性值应该是字符串（如果不是，它们将被强制转换为字符串）或 Array 个字符串（以便为每个标头字段发送一个以上的值）。

¥Headers are represented as own-properties on JavaScript objects. The property keys will be serialized to lower-case. Property values should be strings (if they are not they will be coerced to strings) or an Array of strings (in order to send more than one value per header field).

const headers = {
  ':status': '200',
  'content-type': 'text-plain',
  'ABC': ['has', 'more', 'than', 'one', 'value']
};

stream.respond(headers); 拷贝

传给回调函数的标头对象将有一个 null 原型。这意味着 Object.prototype.toString() 和 Object.prototype.hasOwnProperty() 等普通 JavaScript 对象方法将不起作用。

¥Header objects passed to callback functions will have a null prototype. This means that normal JavaScript object methods such as Object.prototype.toString() and Object.prototype.hasOwnProperty() will not work.

对于传入的标头：

¥For incoming headers:

• :status 标头转换为 number。

  ¥The :status header is converted to number.

• :status、:method、:authority、:scheme、:path、:protocol、age、authorization、access-control-allow-credentials、access-control-max-age、access-control-request-method、content-encoding、content-language、content-length、content-location、content-md5、content-range、content-type、date、dnt、etag、expires、from、host 的副本， if-match、if-modified-since、if-none-match、if-range、if-unmodified-since、last-modified、location、max-forwards、proxy-authorization、range、referer、retry-after、tk、upgrade-insecure-requests、user-agent 或 x-content-type-options 被丢弃。

  ¥Duplicates of :status, :method, :authority, :scheme, :path, :protocol, age, authorization, access-control-allow-credentials, access-control-max-age, access-control-request-method, content-encoding, content-language, content-length, content-location, content-md5, content-range, content-type, date, dnt, etag, expires, from, host, if-match, if-modified-since, if-none-match, if-range, if-unmodified-since, last-modified, location, max-forwards, proxy-authorization, range, referer,retry-after, tk, upgrade-insecure-requests, user-agent or x-content-type-options are discarded.

• set-cookie 始终是数组。重复项被添加到数组中。

  ¥set-cookie is always an array. Duplicates are added to the array.

• 对于重复的 cookie 标头，这些值用 '; 连接在一起'.

  ¥For duplicate cookie headers, the values are joined together with '; '.

• 对于所有其他标头，值使用 ',' 连接。

  ¥For all other headers, the values are joined together with ', '.

const http2 = require('node:http2');
const server = http2.createServer();
server.on('stream', (stream, headers) => {
  console.log(headers[':path']);
  console.log(headers.ABC);
}); 拷贝

敏感标头#

¥Sensitive headers

HTTP2 标头可以标记为敏感，这意味着 HTTP/2 标头压缩算法永远不会索引它们。这对于低熵的标头值是有意义的，并且可能被认为对攻击者是值得的，例如 Cookie 或 Authorization。要实现这一点，请将标头名称作为数组添加到 [http2.sensitiveHeaders] 属性中：

¥HTTP2 headers can be marked as sensitive, which means that the HTTP/2 header compression algorithm will never index them. This can make sense for header values with low entropy and that may be considered valuable to an attacker, for example Cookie or Authorization. To achieve this, add the header name to the [http2.sensitiveHeaders] property as an array:

const headers = {
  ':status': '200',
  'content-type': 'text-plain',
  'cookie': 'some-cookie',
  'other-sensitive-header': 'very secret data',
  [http2.sensitiveHeaders]: ['cookie', 'other-sensitive-header']
};

stream.respond(headers); 拷贝

对于某些标头，例如 Authorization 和短 Cookie 标头，此标志会自动设置。

¥For some headers, such as Authorization and short Cookie headers, this flag is set automatically.

此属性也为接收到的标头设置。它将包含所有标记为敏感的标头的名称，包括自动标记为敏感的标头。

¥This property is also set for received headers. It will contain the names of all headers marked as sensitive, including ones marked that way automatically.

设置对象#

¥Settings object

http2.getDefaultSettings()、http2.getPackedSettings()、http2.createServer()、http2.createSecureServer()、http2session.settings()、http2session.localSettings 和 http2session.remoteSettings API 返回或接收一个对象作为输入，该对象定义了 Http2Session 对象的配置设置。这些对象是包含以下属性的普通 JavaScript 对象。

¥The http2.getDefaultSettings(), http2.getPackedSettings(), http2.createServer(), http2.createSecureServer(), http2session.settings(), http2session.localSettings, and http2session.remoteSettings APIs either return or receive as input an object that defines configuration settings for an Http2Session object. These objects are ordinary JavaScript objects containing the following properties.

• headerTableSize <number> 指定用于标头压缩的最大字节数。最小允许值为 0。允许的最大值为 2³²-1。默认值：4096。

  ¥headerTableSize <number> Specifies the maximum number of bytes used for header compression. The minimum allowed value is 0. The maximum allowed value is 2³²-1. Default: 4096.

• enablePush <boolean> 如果在 Http2Session 实例上允许 HTTP/2 推送流，则指定 true。默认值：true。

  ¥enablePush <boolean> Specifies true if HTTP/2 Push Streams are to be permitted on the Http2Session instances. Default: true.

• initialWindowSize <number> 为流级流量控制指定发送方的初始窗口大小（以字节为单位）。最小允许值为 0。允许的最大值为 2³²-1。默认值：65535。

  ¥initialWindowSize <number> Specifies the sender's initial window size in bytes for stream-level flow control. The minimum allowed value is 0. The maximum allowed value is 2³²-1. Default: 65535.

• maxFrameSize <number> 指定最大帧有效载荷的字节大小。最小允许值为 16,384。允许的最大值为 2²⁴-1。默认值：16384。

  ¥maxFrameSize <number> Specifies the size in bytes of the largest frame payload. The minimum allowed value is 16,384. The maximum allowed value is 2²⁴-1. Default: 16384.

• maxConcurrentStreams <number> 指定 Http2Session 上允许的最大并发流数。没有默认值，这意味着至少在理论上，在 Http2Session 中的任何给定时间可以同时打开 2³²-1 个流。最小值为 0。允许的最大值为 2³²-1。默认值：4294967295。

  ¥maxConcurrentStreams <number> Specifies the maximum number of concurrent streams permitted on an Http2Session. There is no default value which implies, at least theoretically, 2³²-1 streams may be open concurrently at any given time in an Http2Session. The minimum value is 0. The maximum allowed value is 2³²-1. Default: 4294967295.

• maxHeaderListSize <number> 指定将被接受的标头列表的最大大小（未压缩的八位字节）。最小允许值为 0。允许的最大值为 2³²-1。默认值：65535。

  ¥maxHeaderListSize <number> Specifies the maximum size (uncompressed octets) of header list that will be accepted. The minimum allowed value is 0. The maximum allowed value is 2³²-1. Default: 65535.

• maxHeaderSize <number> maxHeaderListSize 的别名。

  ¥maxHeaderSize <number> Alias for maxHeaderListSize.

• enableConnectProtocol <boolean> 如果要启用 RFC 8441 定义的 "扩展连接协议"，则指定 true。此设置仅在服务器发送时才有意义。一旦为给定的 Http2Session 启用了 enableConnectProtocol 设置，就无法禁用它。默认值：false。

  ¥enableConnectProtocol<boolean> Specifies true if the "Extended Connect Protocol" defined by RFC 8441 is to be enabled. This setting is only meaningful if sent by the server. Once the enableConnectProtocol setting has been enabled for a given Http2Session, it cannot be disabled. Default: false.

设置对象上的所有附加属性都将被忽略。

¥All additional properties on the settings object are ignored.

错误处理#

¥Error handling

使用 node:http2 模块时可能会出现几种类型的错误情况：

¥There are several types of error conditions that may arise when using the node:http2 module:

当传入不正确的参数、选项或设置值时，则会发生验证错误。这些将始终由同步 throw 报告。

¥Validation errors occur when an incorrect argument, option, or setting value is passed in. These will always be reported by a synchronous throw.

在不正确的时间尝试操作时会发生状态错误（例如，尝试在流关闭后在流上发送数据）。这些将使用同步 throw 或通过 Http2Stream、Http2Session 或 HTTP/2 服务器对象上的 'error' 事件报告，具体取决于错误发生的位置和时间。

¥State errors occur when an action is attempted at an incorrect time (for instance, attempting to send data on a stream after it has closed). These will be reported using either a synchronous throw or via an 'error' event on the Http2Stream, Http2Session or HTTP/2 Server objects, depending on where and when the error occurs.

当 HTTP/2 会话意外失败时会发生内部错误。这些将通过 Http2Session 或 HTTP/2 服务器对象上的 'error' 事件报告。

¥Internal errors occur when an HTTP/2 session fails unexpectedly. These will be reported via an 'error' event on the Http2Session or HTTP/2 Server objects.

当违反各种 HTTP/2 协议约束时会发生协议错误。这些将使用同步 throw 或通过 Http2Stream、Http2Session 或 HTTP/2 服务器对象上的 'error' 事件报告，具体取决于错误发生的位置和时间。

¥Protocol errors occur when various HTTP/2 protocol constraints are violated. These will be reported using either a synchronous throw or via an 'error' event on the Http2Stream, Http2Session or HTTP/2 Server objects, depending on where and when the error occurs.

标头名称和值中的无效字符处理#

¥Invalid character handling in header names and values

HTTP/2 实现比 HTTP/1 实现更严格地处理 HTTP 标头名称和值中的无效字符。

¥The HTTP/2 implementation applies stricter handling of invalid characters in HTTP header names and values than the HTTP/1 implementation.

标头字段名称不区分大小写，并且严格按照小写字符串在网络上传输。Node.js 提供的 API 允许将标头名称设置为混合大小写字符串（例如 Content-Type），但会在传输时将其转换为小写（例如 content-type）。

¥Header field names are case-insensitive and are transmitted over the wire strictly as lower-case strings. The API provided by Node.js allows header names to be set as mixed-case strings (e.g. Content-Type) but will convert those to lower-case (e.g. content-type) upon transmission.

标头字段名称必须仅包含以下一种或多种 ASCII 字符：a-z、A-Z、0-9、!、#、$、%、&、'、*、+、-、.、^、_、```（反引号）、| 和 ~。

¥Header field-names must only contain one or more of the following ASCII characters: a-z, A-Z, 0-9, !, #, $, %, &, ', *, +, -, ., ^, _, ` (backtick), |, and ~.

在 HTTP 标头字段名称中使用无效字符将导致流关闭并报告协议错误。

¥Using invalid characters within an HTTP header field name will cause the stream to be closed with a protocol error being reported.

根据 HTTP 规范的要求，标头字段值的处理更为宽松，但不应包含换行符或回车符，并且应限于 US-ASCII 字符。

¥Header field values are handled with more leniency but should not contain new-line or carriage return characters and should be limited to US-ASCII characters, per the requirements of the HTTP specification.

在客户端推流#

¥Push streams on the client

要在客户端接收推送流，则在 ClientHttp2Session 上为 'stream' 事件设置监听器：

¥To receive pushed streams on the client, set a listener for the 'stream' event on the ClientHttp2Session:

const http2 = require('node:http2');

const client = http2.connect('http://localhost');

client.on('stream', (pushedStream, requestHeaders) => {
  pushedStream.on('push', (responseHeaders) => {
    // Process response headers
  });
  pushedStream.on('data', (chunk) => { /* handle pushed data */ });
});

const req = client.request({ ':path': '/' }); 拷贝

支持 CONNECT 方法#

¥Supporting the CONNECT method

CONNECT 方法用于允许 HTTP/2 服务器用作 TCP/IP 连接的代理。

¥The CONNECT method is used to allow an HTTP/2 server to be used as a proxy for TCP/IP connections.

简单的 TCP 服务器：

¥A simple TCP Server:

const net = require('node:net');

const server = net.createServer((socket) => {
  let name = '';
  socket.setEncoding('utf8');
  socket.on('data', (chunk) => name += chunk);
  socket.on('end', () => socket.end(`hello ${name}`));
});

server.listen(8000); 拷贝

HTTP/2 CONNECT 代理：

¥An HTTP/2 CONNECT proxy:

const http2 = require('node:http2');
const { NGHTTP2_REFUSED_STREAM } = http2.constants;
const net = require('node:net');

const proxy = http2.createServer();
proxy.on('stream', (stream, headers) => {
  if (headers[':method'] !== 'CONNECT') {
    // Only accept CONNECT requests
    stream.close(NGHTTP2_REFUSED_STREAM);
    return;
  }
  const auth = new URL(`tcp://${headers[':authority']}`);
  // It's a very good idea to verify that hostname and port are
  // things this proxy should be connecting to.
  const socket = net.connect(auth.port, auth.hostname, () => {
    stream.respond();
    socket.pipe(stream);
    stream.pipe(socket);
  });
  socket.on('error', (error) => {
    stream.close(http2.constants.NGHTTP2_CONNECT_ERROR);
  });
});

proxy.listen(8001); 拷贝

HTTP/2 CONNECT 客户端：

¥An HTTP/2 CONNECT client:

const http2 = require('node:http2');

const client = http2.connect('http://localhost:8001');

// Must not specify the ':path' and ':scheme' headers
// for CONNECT requests or an error will be thrown.
const req = client.request({
  ':method': 'CONNECT',
  ':authority': `localhost:${port}`
});

req.on('response', (headers) => {
  console.log(headers[http2.constants.HTTP2_HEADER_STATUS]);
});
let data = '';
req.setEncoding('utf8');
req.on('data', (chunk) => data += chunk);
req.on('end', () => {
  console.log(`The server says: ${data}`);
  client.close();
});
req.end('Jane'); 拷贝

扩展的 CONNECT 协议#

¥The extended CONNECT protocol

RFC 8441 定义了 HTTP/2 的 "扩展连接协议" 扩展，可用于使用 CONNECT 方法引导使用 Http2Stream 作为其他通信协议（例如 WebSockets）的隧道。

¥RFC 8441 defines an "Extended CONNECT Protocol" extension to HTTP/2 that may be used to bootstrap the use of an Http2Stream using the CONNECT method as a tunnel for other communication protocols (such as WebSockets).

扩展连接协议的使用由 HTTP/2 服务器通过使用 enableConnectProtocol 设置启用：

¥The use of the Extended CONNECT Protocol is enabled by HTTP/2 servers by using the enableConnectProtocol setting:

const http2 = require('node:http2');
const settings = { enableConnectProtocol: true };
const server = http2.createServer({ settings }); 拷贝

一旦客户端从服务器收到指示可以使用扩展 CONNECT 的 SETTINGS 帧，它可能会发送使用 ':protocol' HTTP/2 伪标头的 CONNECT 请求：

¥Once the client receives the SETTINGS frame from the server indicating that the extended CONNECT may be used, it may send CONNECT requests that use the ':protocol' HTTP/2 pseudo-header:

const http2 = require('node:http2');
const client = http2.connect('http://localhost:8080');
client.on('remoteSettings', (settings) => {
  if (settings.enableConnectProtocol) {
    const req = client.request({ ':method': 'CONNECT', ':protocol': 'foo' });
    // ...
  }
}); 拷贝

兼容性接口#

¥Compatibility API

Compatibility API 的目标是在使用 HTTP/2 时提供与 HTTP/1 类似的开发者体验，从而可以开发同时支持 HTTP/1 和 HTTP/2 的应用。该 API 仅针对 HTTP/1 的公共 API。然而，许多模块使用内部方法或状态，并且不支持这些，因为它们是完全不同的实现。

¥The Compatibility API has the goal of providing a similar developer experience of HTTP/1 when using HTTP/2, making it possible to develop applications that support both HTTP/1 and HTTP/2. This API targets only the public API of the HTTP/1. However many modules use internal methods or state, and those are not supported as it is a completely different implementation.

以下示例使用兼容性 API 创建 HTTP/2 服务器：

¥The following example creates an HTTP/2 server using the compatibility API:

const http2 = require('node:http2');
const server = http2.createServer((req, res) => {
  res.setHeader('Content-Type', 'text/html');
  res.setHeader('X-Foo', 'bar');
  res.writeHead(200, { 'Content-Type': 'text/plain; charset=utf-8' });
  res.end('ok');
}); 拷贝

要创建混合的 HTTPS 和 HTTP/2 服务器，请参阅 ALPN 协商 部分。不支持从非 tls HTTP/1 服务器升级。

¥In order to create a mixed HTTPS and HTTP/2 server, refer to the ALPN negotiation section. Upgrading from non-tls HTTP/1 servers is not supported.

HTTP/2 兼容性 API 由 Http2ServerRequest 和 Http2ServerResponse 组成。其目标是与 HTTP/1 的 API 兼容，但其并没有隐藏协议之间的差异。例如，HTTP 代码的状态消息被忽略。

¥The HTTP/2 compatibility API is composed of Http2ServerRequest and Http2ServerResponse. They aim at API compatibility with HTTP/1, but they do not hide the differences between the protocols. As an example, the status message for HTTP codes is ignored.

ALPN 协商#

¥ALPN negotiation

ALPN 协商允许在同一个套接字上同时支持 HTTPS 和 HTTP/2。req 和 res 对象可以是 HTTP/1 或 HTTP/2，应用必须将自身限制为 HTTP/1 的公共 API，并检测是否可以使用 HTTP/2 的更高级功能。

¥ALPN negotiation allows supporting both HTTPS and HTTP/2 over the same socket. The req and res objects can be either HTTP/1 or HTTP/2, and an application must restrict itself to the public API of HTTP/1, and detect if it is possible to use the more advanced features of HTTP/2.

以下示例创建了支持两种协议的服务器：

¥The following example creates a server that supports both protocols:

const { createSecureServer } = require('node:http2');
const { readFileSync } = require('node:fs');

const cert = readFileSync('./cert.pem');
const key = readFileSync('./key.pem');

const server = createSecureServer(
  { cert, key, allowHTTP1: true },
  onRequest
).listen(4443);

function onRequest(req, res) {
  // Detects if it is a HTTPS request or HTTP/2
  const { socket: { alpnProtocol } } = req.httpVersion === '2.0' ?
    req.stream.session : req;
  res.writeHead(200, { 'content-type': 'application/json' });
  res.end(JSON.stringify({
    alpnProtocol,
    httpVersion: req.httpVersion
  }));
} 拷贝