'information' 事件

• info <Object>
  • httpVersion <string>
  • httpVersionMajor <integer>
  • httpVersionMinor <integer>
  • statusCode <integer>
  • statusMessage <string>
  • headers <Object>
  • rawHeaders <string[]>

当服务器发送 1xx 中间响应（不包括 101 升级）时触发。 此事件的监听器将接收一个对象，其中包含 HTTP 版本、状态码、状态消息、键值标头对象和带有原始标头名称及其各自值的数组。

const http = require('http');

const options = {
  host: '127.0.0.1',
  port: 8080,
  path: '/length_request'
};

// 发出请求
const req = http.request(options);
req.end();

req.on('information', (info) => {
  console.log(`Got information prior to main response: ${info.statusCode}`);
});

101 升级状态不会触发此事件，因为它们脱离了传统的 HTTP 请求/响应链，例如 Web 套接字、就地 TLS 升级或 HTTP 2.0。 要收到 101 升级通知，请改为监听 'upgrade' 事件。

• info <Object>
  • httpVersion <string>
  • httpVersionMajor <integer>
  • httpVersionMinor <integer>
  • statusCode <integer>
  • statusMessage <string>
  • headers <Object>
  • rawHeaders <string[]>

Emitted when the server sends a 1xx intermediate response (excluding 101 Upgrade). The listeners of this event will receive an object containing the HTTP version, status code, status message, key-value headers object, and array with the raw header names followed by their respective values.

const http = require('http');

const options = {
  host: '127.0.0.1',
  port: 8080,
  path: '/length_request'
};

// Make a request
const req = http.request(options);
req.end();

req.on('information', (info) => {
  console.log(`Got information prior to main response: ${info.statusCode}`);
});

101 Upgrade statuses do not fire this event due to their break from the traditional HTTP request/response chain, such as web sockets, in-place TLS upgrades, or HTTP 2.0. To be notified of 101 Upgrade notices, listen for the 'upgrade' event instead.