[libmicrohttpd] libmicrohttpd 0.9.55 https and MHD_USE_EPOLL

[Denis Dowling]

Hi All,

 

I recently updated some code to use version 0.9.55 of libmicrohttpd. After the change I noticed that larger (~100kB) HTTPS requests are blocking forever. During the change I swapped from using the option MHD_USE_POLL to MHD_USE_AUTO. I can see from an strace that libmicrohttpd is now using epoll() for the dispatching.  If I switch back to MHD_USE_POLL then everything works fine again. If I use HTTP requests then everything is fine so it is something to do with the combination of HTTPS and epoll(). Other options are MHD_USE_INTERNAL_POLLING_THREAD | MHD_USE_SUSPEND_RESUME | MHD_USE_TLS.

 

Has anyone seen anything similar? I am running on CentOS7.3. The same issue also appears on Redhat7.4. I will try to modify one of the example applications in libmicrohttpd to demonstrate the issue.

 

Regards,

Denis

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