fixed issue #364 'proxyError' event emitted twice

[erasmospunk]

For this issue I just commented instead of deleting the unneeded code because I only tried the normal http parts, not the web sockets but I believe that 99,9% is correct.

After some research this part is causing the problem:

reverseProxy.once('socket', function (socket) {
  socket.once('error', proxyError);
});

This is not needed as node.js' ClientRequest object (here the reverseProxy) attaches a listener to the socket 'error'

socket.on('error', socketErrorListener);

The socketErrorListener just re-emits the error from the ClientRequest object.

Look in https://github.com/joyent/node/blob/master/lib/http.js for the socketErrorListener references.

[indexzero]

Your logic is sound, but if you're going to remove code, remove it. Don't comment it out with big comments saying why it shouldn't be there.

[erasmospunk]

You are right, just removed.