Caronte: the best way to implemente modification on the request and on the response ?

[abarre]

hi,
after reading the code, I see that the middleware feature wasn't on the source code anymore.

So I have few questions :

• how can we do some asynchronous verification/modification on the request ? It was easy with the middleware but I don't see how to do it now. I see that some events are emitted but it's not possible to perform a async job on an event.
• I would like to be able to modify the response going to the client. I don't know where I can add a stream that transform the response (See http://nodejs.org/docs/v0.10.0/api/stream.html#stream_class_stream_transform). Is there any hook that I missed?

If we agree on the best way to extend the proxy, I would be glad to contribute with a pull request.

[makeusabrew]

Hi all, struggling with exactly the same thing - async modifications on the request / response. I can see the 'passes' logic but that all just runs in a synchronous loop (plus I couldn't actually get the 'before' or 'after' modifier methods to work since this.passes is undefined).

[yawnt]

hi!

you can just proxy manually and modify there

eg

var proxy = caronte.createProxyServer();
http.createServer(function(req, res) {
  // my actions
  proxy.web(req, res, { target: 'http://mywebsite.com' });
}).listen(8000);

[Rush]

I would like to achieve something like this (let's say this would be async modification of response coming to the client)

var proxy = caronte.createProxyServer();
http.createServer(function(req, res) {
    var proxyResponse;
    req.on('end', function() {
        proxyResponse.finish(res);
    });
    proxyResponse = proxy.webBegin(req, { target: 'http://mywebsite.com' });
});

This is because of Chrome bug preventing node-spdy usage. The workaround is to delay response sending until request ends ... any ideas if this is achievable using current API? I think not. Maybe patching the response object could be other solution.

[yawnt]

i'd rather not patch request.. caronte uses streams2 api.. perhaps you could try to play around with .pause() and .resume()

[Rush]

My question still stands, I do not see how .pause() and .resume() may help me. However, I have a different question.
How would I go on implementing changing of proxyResponse data? For example - appending some content to the proxied HTML.

[yawnt]

write a stream that implements res semantics with custom logic on write and end :)
then do something like

proxy.web(req, wrapStream(res));

where wrapStream returns an instance of your stream

[cheddar]

I agree that the current implementation makes it really difficult to do this sort of thing. I created

#582

To make it easier to just attach some headers. But, there should be some sort of API to allow me to add place passes into their correct location.

[gdw2]

Here are some middleware examples:
https://github.com/nodejitsu/node-http-proxy/tree/caronte/examples/middleware

[macscripter]

https://github.com/nodejitsu/node-http-proxy/tree/caronte/examples/middleware

This link seems to be broken......

I think I have a similar problem... See my code:

var http = require('http'),
httpProxy = require('http-proxy'),
proxy = httpProxy.createProxyServer({});
var miTarget='web:CountryName';
var inicio = '<'+miTarget+'>';
var fin = '</'+miTarget+'>';

var server = http.createServer(function(req, res) {
  var miTag = ''; 

  req.on('data', function (data) {
  // here I recover the parameter I need...
miTag=data.toString().split(inicio)[1].split(fin)[0];

});

req.on('end', function () {
console.log('miTag:'+miTag);
// After I got the parameter I want to proxy to a server depending on the parameter's value....
if(miTag=='Portugal') {
proxy.web(req, res, {target: 'http://www.webservicex.net'});
}
else {
proxy.web(req, res, {target: 'http://other/host'}); 
}
});     

});

[LiranBri]

I created a Fork with an ability for passing async handler to proxyReqWs.
see here: #1403