Document websocket support

[sjberman]

As an NGF user
I want to know how to use NGF works with websocket applications
So that I can run my websocket application fronted by NGF.

Acceptance

• Write a brief document or paragraph on how to use websocket services with NGF
  • This really just involves the client setting the Upgrade: websocket header in a request.
  • Any additional websocket-specific headers can be specified in a header filter if necessary (like Sec-WebSocket-Key or Sec-WebSocket-Version

[idc77]

An example default route
this is of type Exact

    location = /query {
        

        

        proxy_http_version 1.1;
        proxy_set_header Host "$gw_api_compliant_host";
        proxy_set_header X-Forwarded-For "$proxy_add_x_forwarded_for";
        proxy_set_header Upgrade "$http_upgrade";
        proxy_set_header Connection "$connection_upgrade";
        proxy_set_header X-Real-IP "$remote_addr";
        proxy_set_header X-Forwarded-Proto "$scheme";
        proxy_set_header X-Forwarded-Host "$host";
        proxy_set_header X-Forwarded-Port "$server_port";
        proxy_pass http://blogs_blogs-be_80$request_uri;
            
            
            
    }

So websocket support is there by default

[sjberman]

Yes, websockets are supported. We just want to make sure we document it so users are aware.

[github-actions]

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