node.js - 为什么这个 node.js http 请求会无限期挂起？

Question

我正在尝试使用以下代码获取 HTTP 响应 header :

var http = require('http');

const options = {
    hostname: 'google.com',
    port: 443,
    path: '/',
    method: 'GET'
  };

  const req = http.request(options, (res) => {
    console.log(`STATUS: ${res.statusCode}`);
    console.log(`HEADERS: ${JSON.stringify(res.headers)}`);
    res.setEncoding('utf8');
    res.on('data', (chunk) => {
      console.log(`BODY: ${chunk}`);
    });
    res.on('end', () => {
      console.log('No more data in response.');
    });
  });

  req.on('error', (e) => {
    console.error(`problem with request: ${e.message}`);
  });

然而，这段代码只是无限期地卡在 Node 中，没有输出或退出。为什么是这样？我从这里的官方文档中改编了这个:https://nodejs.org/api/http.html#http_http_request_options_callback

Answer 1

首先，您在最后错过了对 req.end() 的调用，即使 documentation you've cited明确指出

With http.request() one must always call req.end() to signify the end of the request - even if there is no data being written to the request body.

然后，端口 443 用于 HTTPS 而不是普通 HTTP。这意味着您必须使用 https 接口(interface)而不是 http:

var https = require('https');
...
const req = https.request(options, (res) => {