Thanks both, that explains it!
I was confused because we have a production HAproxy system that also has "mode http" in the defaults but sends an empty FIN ACK in this case. That is because that HAProxy is SSL-enabled, however, so it makes sense now! Kind regards, Pieter On Mon, Aug 27, 2018 at 5:28 PM Willy Tarreau <w...@1wt.eu> wrote: > Hi Aleks, Pieter, > > On Mon, Aug 27, 2018 at 04:26:29PM +0200, Aleksandar Lazic wrote: > > Hi. > > > > Am 27.08.2018 um 15:03 schrieb Pieter Thysebaert: > (...) > > > defaults > > > log global > > > mode http > > > > The default mode is http. > > When you change to tcp no http error message will be send. > > Sure but that's very likely not the goal here :-) The 400 is returned > by default if an invalid or incomplete response is sent on the socket. > If it is desired that an empty connection is not accounted as an error > for example because you have a monitoring system sending probes to check > the ports, then it's possible to do it by adding this line to the frontend > : > > option http-ignore-probes > > However, be careful as it also means that requests truncated due to MTU > issues caused by VPNs will not be detected. It really depends on the > environment. I'd say as a rule of thumb, do not use this option unless > you're annoyed by logs of empty requests or the error response causes > trouble to a picky client. > > Regards, > Willy >