Is there a graceful way to drain a keep-alive connection server side?

[eseres]

Is there a graceful way to drain a keep-alive connection server side?

[essen]

You must have the pid of the connection process(es) you want to shut down, and call sys:terminate/2 using it. Cowboy will initiate a graceful connection closure. This works for all protocols (Connection: close is HTTP/1.1 only).

If there's no request ongoing, the connection gets closed immediately. Otherwise, the ongoing request(s) will be the last one(s). Note that for HTTP/1.1, pipelined requests that haven't started being processed will not be handled.