[gurrone]

nginx behaves RfC conform. So if you sent it a SIGHUP it will try to respawn all workers by closing (from the server side) all open connections. The problem is that this behaviour confuses some HTTP libs/connection pooler more then others. For example OkHTTP seems to be able to deal with it, but others not so much. Once you reach like 6-12 reloads per second you run into latency issues because you've to establish a new connection for every request, and if you're still running with HTTP/1.1 every benefit of idle connections and connection pooling is defeated. Examples like Traefik (or more old school the F5 BigIP LTM) split frontend and backend handling of connections, and deal with so many reloads more gracefully. Beside of avoiding issues with HTTP libs it at least improves your latency.