[libmicrohttpd] Out of band authentication with libmicrohttpd

[Daniel Tweed, Mr]

I'm really new to libmicrohttpd and the examples/tutorial have been really helpful, but I can't figure out how to implement one specific thing I need.

What I am trying to achieved is:

1. Send http 102 to client who requested anydoc.html which requires authentication

2. Some processing on the serverside, including out of band authentication

3. If authenticated, send response built from somedoc.html, otherwise generic not auth message

I'm having a failure of understanding somewhere, in that I cannot seem to figure out how to send the 102 and save the connection details so that I can forward the response in step 3.   I had thought I could queue a response then either enter a wait loop or suspend the connection, but as far as I can tell I have to return from the MHD_AcceptPolicyCallback for the response to be sent.   Then I cannot figure out how to get back to the connection as I cannot suspend it and save the pointer. I have looked at the request completed call back but this still results in the 102 not being sent. 

I really can't figure out a process to achieve these steps from the examples or the manual.  I'm sure I'm either missing something about http processing or about libmicrohttpd any help or advice would be appreciated.  I'm happy to share anything that would make my question clearer, including more details on the overall application or specific code I am working with.

Thanks,

Daniel