Problems with HttpServer not stopping on stop call

Hello,

I have noticed an issue concerning proxygen's http server (v2019.05.13.00) while trying to stop it gracefully under fairly intense http requesting conditions. Indeed, the http server will not stop and stay blocked on the _`void HTTPServer::stop()`_ call (blocks on the _`bootstrap.join()`_ call in stop method).

It also seems like the stopping call completes if the work load briefly decreases or stops.

Have you encountered this issue before, and if so are there any workarounds ?

Thanks,
Michael.