nodejs http proxy

<p align="center"> <img src="https://raw.github.com/nodejitsu/node-http-proxy/master/doc/logo.png"/> </p> node-http-proxy ======= `node-http-proxy` is an HTTP programmable proxying library that supports websockets. It is suitable for implementing components such as proxies and load balancers. ### Installation `npm install http-proxy --save` ### Build Status <p align="center"> <a href="https://travis-ci.org/nodejitsu/node-http-proxy" target="_blank"> <img src="https://travis-ci.org/nodejitsu/node-http-proxy.png"/></a>&nbsp;&nbsp; <a href="https://coveralls.io/r/nodejitsu/node-http-proxy" target="_blank"> <img src="https://coveralls.io/repos/nodejitsu/node-http-proxy/badge.png"/></a> </p> ### Looking to Upgrade from 0.8.x ? Click [here](UPGRADING.md) ### Core Concept A new proxy is created by calling `createProxyServer` and passing an `options` object as argument ([valid properties are available here](lib/http-proxy.js#L33-L50)) ```javascript var httpProxy = require('http-proxy'); var proxy = httpProxy.createProxyServer(options); ``` An object will be returned with four values: * web `req, res, [options]` (used for proxying regular HTTP(S) requests) * ws `req, socket, head, [options]` (used for proxying WS(S) requests) * listen `port` (a function that wraps the object in a webserver, for your convenience) * close `[callback]` (a function that closes the inner webserver and stops listening on given port) It is then possible to proxy requests by calling these functions ```javascript http.createServer(function(req, res) { proxy.web(req, res, { target: 'http://mytarget.com:8080' }); }); ``` Errors can be listened on either using the Event Emitter API ```javascript proxy.on('error', function(e) { ... }); ``` or using the callback API ```javascript proxy.web(req, res, { target: 'http://mytarget.com:8080' }, function(e) { ... }); ``` When a request is proxied it follows two different pipelines ([available here](lib/http-proxy/passes)) which apply transformations to both the `req` and `res` object. The first pipeline (ingoing) is responsible for the creation and manipulation of the stream that connects your client to the target. The second pipeline (outgoing) is responsible for the creation and manipulation of the stream that, from your target, returns data to the client. #### Setup a basic stand-alone proxy server ```js var http = require('http'), httpProxy = require('http-proxy'); // // Create your proxy server and set the target in the options. // httpProxy.createProxyServer({target:'http://localhost:9000'}).listen(8000); // // Create your target server // http.createServer(function (req, res) { res.writeHead(200, { 'Content-Type': 'text/plain' }); res.write('request successfully proxied!' + '\n' + JSON.stringify(req.headers, true, 2)); res.end(); }).listen(9000); ``` #### Setup a stand-alone proxy server with custom server logic This example show how you can proxy a request using your own HTTP server and also you can put your own logic to handle the request. ```js var http = require('http'), httpProxy = require('http-proxy'); // // Create a proxy server with custom application logic // var proxy = httpProxy.createProxyServer({}); // // Create your custom server and just call `proxy.web()` to proxy // a web request to the target passed in the options // also you can use `proxy.ws()` to proxy a websockets request // var server = http.createServer(function(req, res) { // You can define here your custom logic to handle the request // and then proxy the request. proxy.web(req, res, { target: 'http://127.0.0.1:5060' }); }); console.log("listening on port 5050") server.listen(5050); ``` #### Modify a response from a proxied server Sometimes when you have received a HTML/XML document from the server of origin you would like to modify it before forwarding it on. [Harmon](https://github.com/No9/harmon) allows you to do this in a streaming style so as to keep the pressure on the proxy to a minimum. #### Setup a stand-alone proxy server with proxy request header re-writing This example shows how you can proxy a request using your own HTTP server that modifies the outgoing proxy request by adding a special header. ```js var http = require('http'), httpProxy = require('http-proxy'); // // Create a proxy server with custom application logic // var proxy = httpProxy.createProxyServer({}); // To modify the proxy connection before data is sent, you can listen // for the 'proxyReq' event. When the event is fired, you will receive // the following arguments: // (http.ClientRequest proxyReq, http.IncomingMessage req, // http.ServerResponse res, Object options). This mechanism is useful when // you need to modify the proxy request before the proxy connection // is made to the target. // proxy.on('proxyReq', function(proxyReq, req, res, options) { proxyReq.setHeader('X-Special-Proxy-Header', 'foobar'); }); var server = http.createServer(function(req, res) { // You can define here your custom logic to handle the request // and then proxy the request. proxy.web(req, res, { target: 'http://127.0.0.1:5060' }); }); console.log("listening on port 5050") server.listen(5050); ``` #### Setup a stand-alone proxy server with latency ```js var http = require('http'), httpProxy = require('http-proxy'); // // Create a proxy server with latency // var proxy = httpProxy.createProxyServer(); // // Create your server that makes an operation that waits a while // and then proxies the request // http.createServer(function (req, res) { // This simulates an operation that takes 500ms to execute setTimeout(function () { proxy.web(req, res, { target: 'http://localhost:9008' }); }, 500); }).listen(8008); // // Create your target server // http.createServer(function (req, res) { res.writeHead(200, { 'Content-Type': 'text/plain' }); res.write('request successfully proxied to: ' + req.url + '\n' + JSON.stringify(req.headers, true, 2)); res.end(); }).listen(9008); ``` #### Listening for proxy events * `error`: The error event is emitted if the request to the target fail. * `proxyRes`: This event is emitted if the request to the target got a response. * `open`: This event is emitted once the proxy websocket was created and piped into the target websocket. * `close`: This event is emitted once the proxy websocket was closed. * (DEPRECATED) `proxySocket`: Deprecated in favor of `open`. ```js var httpProxy = require('http-proxy'); // Error example // // Http Proxy Server with bad target // var proxy = httpProxy.createServer({ target:'http://localhost:9005' }); proxy.listen(8005); // // Listen for the `error` event on `proxy`. proxy.on('error', function (err, req, res) { res.writeHead(500, { 'Content-Type': 'text/plain' }); res.end('Something went wrong. And we are reporting a custom error message.'); }); // // Listen for the `proxyRes` event on `proxy`. // proxy.on('proxyRes', function (proxyRes, req, res) { console.log('RAW Response from the target', JSON.stringify(proxyRes.headers, true, 2)); }); // // Listen for the `open` event on `proxy`. // proxy.on('open', function (proxySocket) { // listen for messages coming FROM the target here proxySocket.on('data', hybiParseAndLogMessage); }); // // Listen for the `close` event on `proxy`. // proxy.on('close', function (req, socket, head) { // view disconnected websocket connections console.log('Client disconnected'); }); ``` #### Using HTTPS You can activate the validation of a secure SSL certificate to the target connection (avoid self signed certs), just set `secure: true` in the options. ##### HTTPS -> HTTP ```js // // Create the HTTPS proxy server in front of a HTTP server // httpProxy.createServer({ target: { host: 'localhost', port: 9009 }, ssl: { key: fs.readFileSync('valid-ssl-key.pem', 'utf8'), cert: fs.readFileSync('valid-ssl-cert.pem', 'utf8') } }).listen(8009); ``` ##### HT