Nginx: Forward socket requests runing behind proxy

gistfile1.txt

# websocket connections need routing to the real-time-sharelatex service,
# running at localhost:3026 by default.
location /socket.io {
    proxy_pass http://localhost:3026;
    proxy_set_header X-Forwarded-Proto $scheme;
    proxy_set_header Host $http_x_forwarded_host;
    proxy_http_version 1.1;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection "upgrade";
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_read_timeout 3m;
    proxy_send_timeout 3m;
}

# via https://github.com/sharelatex/sharelatex/issues/226#issuecomment-64882027