简单的node.js代理通过将http服务器传递给http请求

问题描述

尝试通过制作简单的http代理服务器来了解有关node.js的更多信息。使用场景很简单：用户 - >代理 - >服务器 - >代理 - >用户

Trying to learn more about node.js by making a simple http proxy server. The use scenario is simple: user -> proxy -> server -> proxy -> user

以下代码一直有效，直到最后一步。无法找到管道连接器输出回用户的方法。

The following code works until the last step. Couldn't find way to pipe connector's output back to the user.

#!/usr/bin/env node

var
    url = require('url'),
    http = require('http'),
    acceptor = http.createServer().listen(3128);

acceptor.on('request', function(request, response) {
    console.log('request ' + request.url);
    request.pause();
    var options = url.parse(request.url);
    options.headers = request.headers;
    options.method = request.method;
    options.agent = false;

    var connector = http.request(options);
    request.pipe(connector);
    request.resume();
//  connector.pipe(response); // doesn't work
//  connector.pipe(request); // doesn't work either
});

使用tcpflow我看到来自浏览器的传入请求，然后是传出代理请求，然后是服务器响应回到代理。不知何故，我无法将响应重新传输回浏览器。

Using tcpflow I see the incoming request from the browser, then the outgoing proxy request, then the server response back to the proxy. Somehow i couldn't manage to retransmit the response back to the browser.

使用管道实现此逻辑的正确方法是什么？

What is the proper way to implement this logic with pipes?

推荐答案

好的。明白了。

更新：NB！正如评论中所报告的那样，此示例不再起作用。很可能是由于Streams2 API更改（节点0.9 +）

UPDATE: NB! As reported in the comments, this example doesn't work anymore. Most probably due to the Streams2 API change (node 0.9+)

管道返回客户端必须在连接器的回调中发生，如下所示：

Piping back to the client has to happen inside connector's callback as follows:

#!/usr/bin/env node

var
    url = require('url'),
    http = require('http'),
    acceptor = http.createServer().listen(3128);

acceptor.on('request', function(request, response) {
    console.log('request ' + request.url);
    request.pause();
    var options = url.parse(request.url);
    options.headers = request.headers;
    options.method = request.method;
    options.agent = false;

    var connector = http.request(options, function(serverResponse) {
            serverResponse.pause();
            response.writeHeader(serverResponse.statusCode, serverResponse.headers);
            serverResponse.pipe(response);
            serverResponse.resume();
    });
    request.pipe(connector);
    request.resume();
});

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