Using Node.js to redirect and proxy normal HTTP+WebSocket traffics based on hostnames

Usually I used to use a single server to host several developing or experimental projects. Thus I need a quick solution to forward different request to these services. I had tried to use nginx before. But now I have a easier way to do so.

1. require modules

   • underscode

   • node-http-proxy

     var http = require('http'),
         _ = require('underscore'),
         httpProxy = require('http-proxy');

2. config proxy(forward) and redirect mappings (hostname based)

   var proxyOptions = {
     router: {
       "api.testAppX.com"     : 'localhost:2041',
       "dev.api.testAppX.com" : 'localhost:2042',
       "www.testAppY.com"     : 'localhost:10520',
       "test.oldApps.com"     : 'localhost:10520',
       'bc.ryanwu.co'         : 'localhost:8888'
     }
   },
     redirectOptions = {
       'olddomain.com'      : 'http://newdomain.com/',
       'www.olddomain.com'  : 'http://newdomain.com/',
       'blog.olddomain.com' : 'http://newdomain.com/blog/'
     };

3. Create an instance of node-http-proxy’s RoutingProxy

   var proxy = new httpProxy.RoutingProxy(proxyOptions);

4. Proxy normal HTTP requests

   var server = http.createServer(function(req, res) {
       var oriHost = req.headers.host,
           //remove port number from original host
           host = oriHost.indexOf(":") ? oriHost.split(':')[0] : oriHost;
   
     //Check matches of redirect hostnames
     if(_.has(redirectOptions, host)) {
       res.writeHead(301, { //You can use 301, 302 or whatever status code
         'Location': redirectOptions[host],
         'Expires': (new Date()).toGMTString()
       });
       res.end();
     } else {
       //Routing proxy will handle the rest of requests
       proxy.proxyRequest(req, res);
     }
   });

5. Proxy websocket requests and listen the main service on specific port

   server.on('upgrade', function(req, socket, head) {
     proxy.proxyWebSocketRequest(req, socket, head);
   });
   
   server.listen(80);

Its very convenient and then I can use a simple forever service to manage this service.

• Download original JavaScript file on here - Gist

• Ref:

  • node-http-proxy-with-redirects.js