No access to Cookies or Session using Nginx
I am using Ratchet behind Nginx (a simple chat application) and for some reason, I can not get sessions or cookies.  Right now, I don't have a domain so I have been using the IP and it works with other PHP scripts, but not Ratchet.

Is there something I have to do differently to get access to $_COOKIE or $_SESSION variables?

Here is my websocket nginx config to help 

```
    map $http_upgrade $connection_upgrade {
            default                                 upgrade;
            ''                                      close;
    }

    upstream websocket {
        server 127.0.0.1:8080;
    }

    server{
            ...
            location /ws/ {
                    proxy_pass                      http://websocket;
                    proxy_http_version              1.1;
                    proxy_set_header                Upgrade $http_upgrade;
                    proxy_set_header                Connection "Upgrade";
                    proxy_read_timeout              999999999;
            }
    }
```
