[libmicrohttpd] MHD_CONNECTION_OPTION_TIMEOUT seems not to work with MHD_create_response_from_callback

[Nicolas Mora]

Hello,

Although it's not easy to reproduce, it seems that using connection 
option MHD_CONNECTION_OPTION_TIMEOUT when streaming data with 
MHD_create_response_from_callback seems not to work, although.

In my application with MHD underneath where the problem occurs, I 
provide a webradio, which is a http stream with unlimited size.

The problem I have is when the client uses a bad wifi connection, or 
when the client moves too far from the wifi antenna, then the client 
device detects the connection is wrong, therefore closes it, but on the 
server side, the connection remains open and never closes, leading to 
phantom connections.

If I use MHD_OPTION_CONNECTION_TIMEOUT in MHD_start_daemon, this 
partially fixes the problem, the server automatically closes the 
connection after the mentionned seconds of total inactivity from the 
client (i.e. the client is not reading the stream anymore but keeps the 
connection open), but it doesn't fix the problem for bad connections.

I'm attaching a simple example that I used to be able to reproduce the 
problem, but I couldn't find a way to reproduce it with a client 
program. Maybe by using netem but I'm not familiar with this command.

/Nicolas

test-mhd-streaming.c
Description: Text Data