'response' 事件

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。 监听器使用两个参数调用：包含接收到的 HTTP/2 标头对象的 Object，以及与标头关联的标志。

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

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