Run the HTTP server in a goroutine and, on SIGINT/SIGTERM, call
srv.Shutdown so it stops accepting connections and lets in-flight
requests finish before exiting (ErrServerClosed is a clean exit). This
stops uploads/streams being cut when the container is stopped or
recreated on deploy.
The drain deadline is configurable via SHUTDOWN_TIMEOUT (default 15s).
docker-compose.yml feeds the same variable into the app's
stop_grace_period, so Docker won't SIGKILL mid-drain and the two values
can't drift.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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