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Minimal nginx WebSocket reverse-proxy example

If you have a nginx config clause like

location /app/ {
    proxy_pass http://app-server;
}

you can easily make it reverse-proxy Websocket connections as well by adding these clauses inside location { ... }:

proxy_http_version 1.1;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection "Upgrade";

Full example:

location /app/ {
    proxy_pass http://app-server;
    proxy_http_version 1.1;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection "Upgrade";
}