If you are using a nginx as a reverse proxy for a websocket and you want to support upgrading ws to wss, you are in trouble. Nginx will consume and upgrade value from the Connection header, as well as the value Upgrade: websocket. You will need to manually pass these values through, e.g.
location / {
proxy_pass http://127.0.0.1:8001;
proxy_set_header Connection $http_connection;
proxy_set_header Upgrade $http_upgrade;
proxy_pass_request_headers on; # this is the same as default values
}
Some links discussing this:
- https://stackoverflow.com/questions/65309160/client-is-not-using-the-websocket-protocol-upgrade-token-not-found-in-connec
- https://github.com/gorilla/websocket/issues/507/
- http://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_pass_request_headers
- https://stackoverflow.com/questions/15193743/nginx-reverse-proxy-websockets