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。
• 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。
  • 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。
  • maxSessionMemory<number> 设置 Http2Session 允许使用的最大内存。 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 可能会导致超出此限制，但超过此限制时，新的 Http2Stream 实例将被拒绝。 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。
  • maxHeaderListPairs <number> 设置标头条目的最大数量。 这类似于 http.Server#maxHeadersCount 或 http.ClientRequest#maxHeadersCount。 最小值为 1。 默认值: 128。
  • maxOutstandingPings <number> 设置未确认的未确认 ping 的最大数量。 默认值: 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。 最大允许值为 2³²-1。 负值将此选项设置为最大允许值。 默认值: 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。
  • 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：
    • http2.constants.PADDING_STRATEGY_NONE: 没有应用填充。
    • http2.constants.PADDING_STRATEGY_MAX: 应用由内部实现决定的最大填充量。
    • 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。
  • 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。
  • 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:'
  • settings <HTTP/2 Settings Object> 连接时发送到远程对等方的初始设置。
  • 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。
  • ...: 可以提供任何 net.connect() 或 tls.connect() 选项。
  • 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。
• listener <Function> 将注册为 'connect' 事件的单次监听器。
• 返回: <ClientHttp2Session>

返回 ClientHttp2Session 实例。

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

/* 使用客户端 */

client.close();

• 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> Sets the maximum dynamic table size for deflating header fields. Default: 4Kib.
  • maxSettings <number> Sets the maximum number of settings entries per SETTINGS frame. The minimum value allowed is 1. Default: 32.
  • 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> Sets the maximum number of header entries. This is similar to http.Server#maxHeadersCount or http.ClientRequest#maxHeadersCount. The minimum value is 1. Default: 128.
  • maxOutstandingPings <number> Sets the maximum number of outstanding, unacknowledged pings. Default: 10.
  • 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 22³²-1. A negative value sets this option to the maximum allowed value. Default: 200.
  • 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> 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: No padding is applied.
    • http2.constants.PADDING_STRATEGY_MAX: The maximum amount of padding, determined by the internal implementation, is applied.
    • 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> 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> 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> The initial settings to send to the remote peer upon connection.
  • 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.
  • ...: Any net.connect() or tls.connect() options can be provided.
  • 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> Will be registered as a one-time listener of the 'connect' event.
• Returns: <ClientHttp2Session>

Returns a ClientHttp2Session instance.

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

/* Use the client */

client.close();