Key error: wsgi.websocket

[nskrypnik]

Hi, all.

When I try to open websocket from chrome/ff via nginx proxy it fails with key error you might look in traceback

127.0.0.1 - - [2012-05-08 03:39:23] "GET /socket.io/1/websocket/896374484054 HTTP/1.1" 500 403720 0.108159
Traceback (most recent call last):
File ".../eggs/gevent-0.13.7-py2.6-linux-x86_64.egg/gevent/greenlet.py", line 390, in run
result = self._run(_self.args, *_self.kwargs)
File ".../eggs/gevent_socketio-0.3.5_beta-py2.6.egg/socketio/server.py", line 65, in handle
handler.handle()
File ".../eggs/gevent-0.13.7-py2.6-linux-x86_64.egg/gevent/pywsgi.py", line 180, in handle
result = self.handle_one_request()
File ".../eggs/gevent-0.13.7-py2.6-linux-x86_64.egg/gevent/pywsgi.py", line 314, in handle_one_request
self.handle_one_response()
File ".../eggs/gevent_socketio-0.3.5_beta-py2.6.egg/socketio/handler.py", line 123, in handle_one_response
jobs = self.transport.connect(socket, request_method)
File ".../eggs/gevent_socketio-0.3.5_beta-py2.6.egg/socketio/transports.py", line 215, in connect
websocket = self.handler.environ['wsgi.websocket']
KeyError: 'wsgi.websocket'

But then I try to connect with application directly it's ok and works fine. As you see nginx proxy module uses http/1.1 connection with my app server.

[dswarbrick]

I've run into this issue with Apache's mod_proxy too. However, are you sure that your websocket will even work via Nginx's proxy module? Websockets require full-duplex communication, and I suspect that most proxies only support a single request/response pair.

[abourget]

Exactly. Nginx doesn't forward all the headers (because it seems Websocket isn't fully HTTP/1.1 compliant) and it doesn't allow for full negotiation of the websocket. Thus, 'wsgi.websocket' isn't inserted in the environment (that's where you get your KeyError). Also, I don't think Nginx is ready to do full-duplex either.

I know it is possible to configure HAProxy to forward everything to the gevent server, so I would suggest looking in that direction.

Since this ticket isn't related to a bug in gevent-socket, I'm going to close it.

Hope this helps.

[laginha]

Nginx supports websockets as you can see here. I've tested it in front of a simple Node.JS server and with Socket.io client. It worked!

Now, in a project i'm currently working on, I'm running Gunicorn + gevent-socketio as recommended in the docs. No problem there. However I've tried to set Nginx up with SSL enabled, like this:

server {
    listen      443;
    server_name  events.hostname;
    ssl on;
    ssl_certificate /path/to/x.crt;
    ssl_certificate_key /path/to/x.key;
    ssl_session_cache shared:SSL:10m;
    ssl_session_timeout  5m;
    location / {
        proxy_pass http://127.0.0.1:8000;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto https;
        proxy_redirect off;
    }
}

Without success.
Every time my Socket.io client tries to connect, it receives a 500 status code due to the KeyError: 'wsgi.websocket' exception. I guessed the "Upgrade" header was missing, which I find weird.

So i changed the configuration a little bit and set the header manually proxy_set_header Upgrade "websocket". As a result the exception is raised no-more. However after a while i get this error Error during WebSocket handshake: 'Upgrade' header is missing on my javascript console.

Dispite this problem may not be related to a bug in gevent-socket, I would appreciate any help. Any ideias of what might be wrong? Am I missing anything?

[jensenw]

I use Gunicorn + nginx1.4.1 ,and add my nginx.conf

   location / {
                   proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

                   proxy_set_header Host $http_host;

                   proxy_redirect off;

                   proxy_pass http://127.0.0.1:8082/;
                   proxy_http_version 1.1;
                   proxy_set_header Upgrade $http_upgrade;
                   proxy_set_header Connection "upgrade";
                    }

when running the code, I keep get this error " KeyError: 'wsgi.websocket' " ,but application stil work and it's little bit slow when trying to connect websocket .

after googling then i'm installing nginx-full and my problem solved ,hope this can help.