Hi,

I'm making tests where I need to check the behavior of my application when there are two concurrent requests to my server, while one is sleeping:

• T=0s Receive request 1 (start sleeping)
• T=2s Receive request 2
• T=2.1s Respond to request 2
• T=5s Respond to request 1

(I can't just start two servers on two different ports, this has to be on the same port.)

This would normally mean just doing time.sleep in my handler for request 1; but this does not work because the WSGI server created by pytest-httpserver is not threaded:

https://github.com/csernazs/pytest-httpserver/blob/master/pytest_httpserver/httpserver.py#L745

(threaded=False, processes=1 by default)

It would be nice to enable the user to specify whether the underlying WSGI server should be threaded, ie adding a threaded named argument somewhere (in start() or in init()), then passing that flag to the WSGI server.

Would you accept such a PR? Or is there another way to achieve what I'm trying to do?