[libmicrohttpd] libmicrohttpd: keep-alive connection alternative?

[Andreas Røsdal]

Hello!

I'm using libmicrohttpd as a HTTP server, and wonder how I should 
configure libmicrohttpd optimally for the way I am using it.
I think that HTTP keep-alive connections support would be perfect,
but since that appears to be unspported I wonder about alternatives.

libmicrohttpd is setup to be a HTTP server in my back-end process.
A single web browser connects to libmicrohttpd through a HTTP proxy
based on the Apache Commons HttpClient. A libmicrohttpd server process
always connects to a single web browser client, because of the proxy.
As a result, the proxy always connects to a single libmicrohttpd process,
where about 4 connections every second is established between the proxy
and libmicrohttpd process. So a a huge amount of connections are created
and closed for the communication between the proxy and libmicrohttpd.

      [Web browser]  <->  [Proxy] <-> [libmicrohttpd]

I suspect in my current config, the connections are not closed and cleaned 
up fast enough, and therefore uses more resources than neccesary.
If I set MHD_OPTION_CONNECTION_TIMEOUT = 1, then the connections are 
cleaned up fast, but then the CPU usage goes to over 50% (way too high).
If I set to MHD_OPTION_CONNECTION_TIMEOUT = 0 (no timeout), then the 
memory usage increases a lot.

So if the same connection could be reused or kept-alive, then I'd hope 
that performance would be greatly improved. So do I need HTTP keep-alive
support, or is there anything I could do to improve my situation?


  - Andreas