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);
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.
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 (res) {
console.log('RAW Response from the target', JSON.stringify(res.headers, true, 2));
});
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.
//
// 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);
//
// Create the proxy server listening on port 443
//
httpProxy.createServer({
ssl: {
key: fs.readFileSync('valid-ssl-key.pem'), 'utf8'),
cert: fs.readFileSync('valid-ssl-cert.pem'), 'utf8')
},
target: 'https://localhost:9010',
secure: true // Depends on your needs, could be false.
}).listen(443);
You can activate the websocket support for the proxy using ws:true
in the options.
//
// Create a proxy server for websockets
//
httpProxy.createServer({
target: 'ws://localhost:9014',
ws: true
}).listen(8014);
Also you can proxy the websocket requests just calling the ws(req, socket, head)
method.
//
// Setup our server to proxy standard HTTP requests
//
var proxy = new httpProxy.createProxyServer({
target: {
host: 'localhost',
port: 9015
}
});
var proxyServer = http.createServer(function (req, res) {
proxy.web(req, res);
});
//
// Listen to the `upgrade` event and proxy the
// WebSocket requests as well.
//
proxyServer.on('upgrade', function (req, socket, head) {
proxy.ws(req, socket, head);
});
proxyServer.listen(8015);
- Search on Google/Github
- If you can't find anything, open an issue
- If you feel comfortable about fixing the issue, fork the repo
- Commit to your local branch (which must be different from
master
) - Submit your Pull Request (be sure to include tests and update documentation)
httpProxy.createProxyServer
supports the following options:
- target: url string to be parsed with the url module
- forward: url string to be parsed with the url module
- agent: object to be passed to http(s).request (see Node's https agent and http agent objects)
- secure: true/false, if you want to verify the SSL Certs
If you are using the proxyServer.listen
method, the following options are also applicable:
- ssl: object to be passed to https.createServer()
- ws: true/false, if you want to proxy websockets
- xfwd: true/false, adds x-forward headers
$ npm test
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