On 30.10.2014 19:01, Dennis Jacobfeuerborn wrote:
...
> 
> [30/Oct/2014:18:46:36.035] front-http front-http/<NOSRV>
> -1/-1/-1/-1/19117 400 187 - - CR-- 49/49/0/0/0 0/0 "<BADREQ>"
...

So after a bit more googling I found the following mail thread that
mentions this as some sort of tcp pre-connect behaviour by browsers:

http://comments.gmane.org/gmane.comp.web.haproxy/10426

Has anyone come of the idea to be able to not count a connection that
gets opened but never used before it times out as an error?
Right now the problem is that while technically these are errors
according to the specs they kind of aren't given the real-world behavior
of browsers these days.

Right now this makes detecting real errors much harder and it would be
great if haproxy would allow an option in a frontend to not count this
specific behavior as an error.

Regards,
   Dennis

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