Issue introduced with the fix for UNDERTOW-1310 in https://github.com/undertow-io/undertow/commit/66a287b06da53fa2479c5fe26bd75cf532817861

Requests may run for longer than ten minutes in some cases, blocking server shutdown. When that behavior is expected the GracefulShutdownHandler can be used.

I am proposing a configurable timeout, and potentially a flag for whether to call shutdownNow or shutdown.