Firefox can't establish a connection to the server at ws://172.16.52.136/ws/electricity_usage?subscribe-broadcast. about django-websocket-redis HOT 3 CLOSED

I just found a bug in the code, but it refers to user-subscription, so this does not affect your setup.

Hmmm, looking at your logs, it seems as if the client is disconnected from the server by someone intermediate, maybe NGiNX or another proxy. Then uWSGI can't receive a PONG, which causes the error logs on the server.

Could you please test with Chrome.

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Sorry, missed this comment/reply. I'll test with Chrome.

Here's the error from Chrome:
WebSocket connection to 'ws://172.16.52.136/ws/datacentre?subscribe-broadcast' failed: Error during WebSocket handshake: 'Connection' header value is not 'Upgrade': keep-alive

That is a much better error! Sounds like you're right. Here's my Nginx configuration:

upstream strata {
  server STRATA_HOST:STRATA_PORT;
}

upstream strata_ws {
  server STRATA_WEBSOCKET_HOST:STRATA_WEBSOCKET_PORT;
}

server {
  listen 80;
  server_name <MY_URL>;

  location /static {
    autoindex on;
    alias /srv/static/;
  }

  location /ws/ {
    proxy_http_version 1.1;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection "upgrade";
    proxy_pass http://strata_ws;
  }

  location / {
    include uwsgi_params;
    uwsgi_pass strata;
  }
}

I'm going to search Google to figure out what's going on here, but this is a good lead.

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So it turns out that Ubuntu 12.04 ships with Nginx 1.1 by default, which is much too old. Using Nginx's Ubuntu repository and upgrading to version 1.4.x fixed my issue.

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