[libmicrohttpd] Complete request on fd becoming ready

[Hein-Pieter van Braam]

Hello all,

I am writing an MHD application where the MHD HTTP server acts as a
proxy between a HTTP REST API and a different binary protocol on the
backend. My MHD application opens a new TCP connection to the backend,
translates the request, and waits for an answer.

The waiting on an answer part would normally be blocking, and reading
the MHD manual I can't come up with a way of using async io here. What
would an MHD application look like that creates response objects from
(another) polling loop, and where do I even place this loop? 

I have been thinking of a variety of convoluted things with threads,
then I figured it'd probably be better to ask the experts :)

Thanks!

- HP