在HTTP请求(node.js)中指定端口号 [英] Specify port number in HTTP request (node.js)

问题描述

在使用请求模块进行HTTP请求时，是否可以指定端口号?我在文档中什么都没有看到:

Is it possible to specify a port number when making at HTTP request using the request module? I'm not seeing anything about this in the documentation:

var request = require('request');

// this works
request({
  method: 'GET',
  url: 'http://example.com'
}, function(error, response, body) {
  if (error) console.log(error);
  console.log(body);
});

// this does not work
request({
  method: 'GET',
  url: 'http://example.com:10080'
}, function(error, response, body) {
  // ...
});

另外，当我运行第二个版本时，程序中绝对没有任何反应(几乎就像从未发出请求一样).

Additionally, when I run the second version, absolutely nothing happens in my program (almost like the request was never made).

我也知道使用核心http模块发出请求时可以指定端口号.为什么在请求模块中没有该选项?

I also know that I can specify a port number when making a request using the core http module. Why is the not an option in the request module?

我之前应该已经提到这一点，但是我正在Heroku上运行此应用程序.

I should have mentioned this before, but I am running this application on Heroku.

当我在本地运行请求时(使用请求模块)，我可以指定端口号，并获得成功的回调.

When I run the request locally (using the request module) I am able to specify the port number, and get a successful callback.

当我从Heroku运行请求时，不会触发任何回调，并且nginx不会显示该请求的记录.

When I run the request from Heroku, no callback is fired, and nginx shows no record of the request.

我疯了吗? Heroku是否有某些原因阻止我向特定端口号发出出站HTTP请求?

Am I crazy? Is there some reason Heroku is preventing me from making an outbound HTTP request to a specific port number?

推荐答案

使用带有完整URL的request作为第一个参数对我有用:

Using request with the complete URL as the first argument works for me:

var http = require('http');
var request = require('request');

// start a test server on some non-standard port
var server = http.createServer(function (req, res) {
  res.end('Hello world');
});
server.listen(1234);

// make the GET request
request('http://127.0.0.1:1234', function (err, res) {
  if (err) return console.error(err.message);

  console.log(res.body);
  // Hello world

  server.close();
});

分别指定method和url也可以:

request({
  method: 'GET',
  url: 'http://127.0.0.1:1234'
}, function (err, res) {
  if (err) return console.error(err.message);

  console.log(res.body);
  // Hello world

  server.close();
});

您可能要检查服务器是否正在运行，以及是否没有位于阻止该端口访问的代理或防火墙之后.

You might want to check that your server is running and that you're not behind a proxy or firewall that prevents access on that port.

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