Re: [libmicrohttpd] Issues with multiple connections

[Christian Grothoff]

Hi!

I've thought about the issue and analyzed the code and found a place
where a response was modified without locking.  This only happens if you
use a threaded MHD and share a response object among multiple
connections and rely on MHD to "complete" the header and are unlucky in
that the response is used by multiple clients before the first one had a
chance to 'complete' the headers.  So that might fit your scenario. I'm
not sure why it is a regression, except that I think the "Connection:
Keep-Alive" header specifically might not have been auto-added in 0.9.25
(and other headers you might have overlooked and/or set yourself and/or
not hit due to timing issues).

Anyway, I've tried to fix this in SVN 33742, please let me know if this
fixes your problem.

Happy hacking!

Christian

On 06/20/2014 02:25 PM, Shilpa S wrote:
> Hello,
> 
> 
> 
> I have the latest version of microhttps installed and when I try to send
> POST request on multiple connections, I randomly get a response which looks
> like this
> 
> 
> 
> HTTP/1.1 201 Created
> 
> Connection: Keep-Alive
> 
> Connection: Keep-Alive
> 
> Content-Length: 0
> 
> 
> 
> .....................................
> 
> 
> 
> or this
> 
> 
> 
> ......................Connection: Keep-Alive
> 
> Content-Length: 0
> 
> Connection: Keep-Alive
> 
> Content-Length: 0
> 
> 
> 
> .....................................
> 
> 
> 
> instead of
> 
> HTTP/1.1 201 Created
> 
> Connection: Keep-Alive
> 
> Content-Length: 0
> 
> Date: Thu, 19 Jun 2014 18:04:47 GMT
> 
> 
> Is there something I need to change or do?
> The version 9.25 was working fine.
> Please advise.
> 
> Thanks,
> Shilpa
>