通过将 http 服务器传输到 http 请求的简单 node.js 代理
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Simple node.js proxy by piping http server to http request
提问by Nikolai Gorchilov
Trying to learn more about node.js by making a simple http proxy server. The use scenario is simple: user -> proxy -> server -> proxy -> user
尝试通过制作一个简单的 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
The following code works until the last step. Couldn't find way to pipe connector's output back to the user.
以下代码工作到最后一步。找不到将连接器的输出通过管道返回给用户的方法。
#!/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
});
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 tcpflow 我看到来自浏览器的传入请求，然后是传出代理请求，然后是服务器响应返回到代理。不知何故，我无法将响应重新传输回浏览器。
What is the proper way to implement this logic with pipes?
用管道实现这个逻辑的正确方法是什么？
回答by Jay
you dont have to 'pause', just 'pipe' is ok
您不必“暂停”，只需“管道”即可
var connector = http.request(options, function(res) {
res.pipe(response, {end:true});//tell 'response' end=true
});
request.pipe(connector, {end:true});
http request will not finish until you tell it is 'end';
http 请求将不会完成，直到您告诉它“结束”；
回答by Nikolai Gorchilov
OK. Got it.
好的。知道了。
UPDATE: NB! As reported in the comments, this example doesn't work anymore. Most probably due to the Streams2 API change (node 0.9+)
更新：注意！如评论中所述，此示例不再有效。很可能是由于 Streams2 API 更改（节点 0.9+）
Piping back to the client has to happen inside connector's callback as follows:
管道回客户端必须在连接器的回调中发生，如下所示：
#!/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();
});
回答by kashesandr
I used the examples from this post to proxy http/s requests. Faced with the problem that cookies were lost somewhere.
我使用这篇文章中的示例来代理 http/s 请求。面临cookie在某处丢失的问题。
So to fix that you need to handle headers from the proxy response.
因此，要解决该问题，您需要处理来自代理响应的标头。
Below the working example:
在工作示例下方：
req = service.request(options, function(res) {
response.writeHead(res.statusCode, res.headers);
return res.pipe(response, {end: true});
});
request.pipe(req, {end: true});
