NGINX and websocket endpoint

Gurumurthy Sundar Gurumurthy.Sundar at
Tue Mar 17 17:42:04 UTC 2015

I am trying to configure nginx as reverse proxy that does authentication and websockets. It proxy-passes request
to apache (/auth/wsgi) for authentication - once that succeeds, it then proxy passes to the websocked backend,
which is a java based websocket endpoint on tomcat 8.

location /basic/alerting/websocket {

            auth_request /auth/wsgi;

            proxy_http_version 1.1;
                    proxy_set_header Upgrade "Websocket";
            proxy_set_header Connection "upgrade";
            proxy_set_header Host $http_host;


The authentication on apache succeeds. However, on the backend tomcat, I get this error:

12572237 [http-nio-8080-exec-10] ERROR  - handleWebSocketVersionNotSupported() Handshake failed due to unsupported WebSocket version: null. Supported versions: [13]

It seems that failure is because the backend is expecting the header ("Sec-WebSocket-Version") which is not getting passed through. I even see in the nginx logs:

2015/03/17 17:28:12 [debug] 20261#0: *718 http proxy header: "Sec-WebSocket-Version: 13"

Is there anything I need to do in the nginx config? Very much appreciate your help.

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