Using node http-proxy to proxy websocket connections

Question

I have an application that uses websockets via socket.io. For my application I would like to use a separate HTTP server for serving the static content and JavaScript for my application. Therefore, I need to put a proxy in place. I am using node-http-proxy. As a starting point I have my websockets app running on port 8081. I am using the following code to re-direct socket.io communications to this standalone server, while using express to serve the static content: ``` var http = require('http'), httpProxy = require('http-proxy'), express = require('express'); // create a server var app = express(); var proxy = httpProxy.createProxyServer({ ws: true }); // proxy HTTP GET / POST app.get('/socket.io/*', function(req, res) { console.log("proxying GET request", req.url); proxy.web(req, res, { target: 'http://localhost:8081'}); }); app.post('/socket.io/*', function(req, res) { console.log("proxying POST request", req.url); proxy.web(req, res, { target: 'http://localhost:8081'}); }); // Proxy…

Accepted Answer

Just stumbled upon your question, and I see that it is still not answered. Well, in case you are still looking for the solution... The problem in your code is that `app.listen(8080)` is just syntactic sugar for

```
require('http').createServer(app).listen(8080)
```

while `app` itself is just a handler function, not an instance of httpServer (I personally believe that this feature should be removed from Express to avoid confusion). Thus, your `app.on('upgrade')` is actually never used. You should instead write

```
var server = require('http').createServer(app);
server.on('upgrade', function (req, socket, head) {
  proxy.ws(req, socket, head);
});
server.listen(8080);
```

Hope, that helps.

Using node http-proxy to proxy websocket connections

Solution

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