Re: [libmicrohttpd] MHD_queue_response return error

[Christian Grothoff]

Yes, you MUST NOT queue a response while *upload_data_size is non-null 
when you are being called (as the upload may still continue)! MHD will 
call you one "final" time with a zero *upload_data_size, and *then* you 
should queue your response.

To summarize, you MAY queue a response either:
1) on the very first call when *upload_data_size is 0 to return an error 
and NOT have the client to the upload (e.g. 4xx/5xx), or
2) on the very last call when *upload_data_size is again 0 to return a 
successful reply.

If you attempt to queue a response when you were called with a non-zero 
*upload_data_size, MHD will not be happy. And yes, you should update 
*upload_data_size to reflect the number of bytes left to process, but 
setting it to 0 does not permit you to immediately queue a response.

I hope this helps!

Happy hacking!

Christian

On 5/22/23 22:01, Avner Flesch wrote:
> Hi,
>
> Maybe someone can help me:
> When I am getting a "POST" request without content - everything is okay, 
> but when I am putting some content in the request, the 
> MHD_queue_response return MHD_NO (and I set *upload_data_size to 0)
>
> Any advice?
>
> Thanks
>
> Avner