[libmicrohttpd] MHD_AccessHandlerCallback won't be called again if *upload_data_size is set to non-zero.

[Nicholas Cooper]

Hi,

Let's say the access handler callback passed to MHD_start_daemon() is 
answer_to_connection(). According to the comment in microhttpd.h, the 
parameter upload_data_size shall be updated to the number of bytes not 
processed. However, it seems that it only works perfectly if the 
*upload_data_size is updated to zero. If its value is set to non-zero, 
answer_to_connection() won't be called again, which leaves the HTTP 
client waiting forever. To be more exact, unless the client sends 
another (unrelated) request, MHD calls answer_to_connection() for the 
suspending request again. Don't know if this is a bug, or I'm misusing 
MHD. Having tried this on both Linux (Debian) and Windows, and both 
don't work. The attached file demonstrates the problem.

Thanks. Have a nice day.

Nicholas Cooper.

a.cpp
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