node-http-proxy is an HTTP programmable proxying library that supports
websockets. It is suitable for implementing components such as
proxies and load balancers.
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A new proxy is created by calling createProxyServer and passing
an options object as argument (valid properties are available here)
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)
Is it then possible to proxy requests by calling these functions
require('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
proxy.on('error', function(e) {
...
});or using the callback API
proxy.web(req, res, { target: 'http://mytarget.com:8080' }, function(e) { ... });When a request is proxied it follows two different pipelines (available here)
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.
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);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.
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 = require('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);var http = require('http'), httpProxy = require('http-proxy'); // // Create a proxy server with latency // var proxy = httpProxy.createProxyServer(); // // Create your server that make an operation that take a while // and then proxy de request // http.createServer(function (req, res) { // This simulate an operation that take 500ms in 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);