monkeypatch socket.io to work with nginx with buffering on (e.g. dotcloud)

gistfile1.coffee

monkeypatch = (io) ->
  # Thanks sugyan++ for the Socket.IO 0.7 workaround: http://d.hatena.ne.jp/sugyan/20110813/1313206163
  io.configure ->
    io.set "transports", ["xhr-polling"]
    io.set "polling duration", 10

    path = require('path')
    HTTPPolling = require(path.join(path.dirname(require.resolve('socket.io')), 'lib', 'transports', 'http-polling'))
    XHRPolling  = require(path.join(path.dirname(require.resolve('socket.io')), 'lib', 'transports', 'xhr-polling'))
    XHRPolling.prototype.doWrite = (data) ->
      HTTPPolling.prototype.doWrite.call(@)

      origin = @req.headers.origin
      headers =
        'Content-Type': 'text/plain; charset=UTF-8'
        'Content-Length': if data is undefined then 0 else Buffer.byteLength(data)

      if origin
        # https://developer.mozilla.org/En/HTTP_Access_Control
        headers['Access-Control-Allow-Origin'] = '*'
        headers['Access-Control-Allow-Credentials'] = 'true' if @req.headers.cookie

      @response.writeHead 200, headers
      @response.write data

exports.monkeypatch = monkeypatch