Never done this, but https://www.howtoforge.com/setenvif_apache2 seems like one 
way to do make it work.

> Am 21.11.2017 um 16:16 schrieb Stefan Priebe - Profihost AG 
> <s.pri...@profihost.ag>:
> 
> 
> Am 21.11.2017 um 16:06 schrieb Stefan Priebe - Profihost AG:
>> Am 21.11.2017 um 15:45 schrieb Stefan Eissing:
>>> 
>>>> Am 21.11.2017 um 14:33 schrieb Stefan Priebe - Profihost AG 
>>>> <s.pri...@profihost.ag>:
>>>> 
>>>> Hello Stefan,
>>>> Hello Yann,
>>>> 
>>>> me the http2 bug tester is calling again ;-)
>>> 
>>> And the day was going so well...
>> 
>> I'm sorry ;-)
>> 
>>>> While running two bash curl while loops the one using http1.1 always
>>>> finishes in < 0.05s while the http2 one takes sometimes 0.4 to 20s to
>>>> finish. Sadly i can't reproduce this all the time - mostly more requests
>>>> more failures. As this is a production server i've no idea how to debug
>>>> as the http2 trace logs might flood the harddisk.
>>> 
>>> Hmmm. Do you know if this happens waiting for a response or at the end of a 
>>> connection? Or in the middle of a body? All GETs or also POSTs?
>> 
>> My Test only contains GET - but most probably there are also running
>> POST requests but not started by me.
>> 
>> Strangely this only happens between 1pm and 2pm a day but i've no idea
>> what's different at that time.
> 
> OK i'm also able to reproduce this whenever your want. Can we activate
> trace logging for a specific IP? So i can generate a http2 log?
> 
>> 
>> I can output a lot of information from curl:
>>       time_namelookup
>>           time_connect
>>        time_appconnect
>>       time_pretransfer
>>          time_redirect
>>     time_starttransfer
>> 
>> Another way might be to enable trace logging only for "my" IP? Is
>> something like this possible?
>> 
>> Greets,
>> Stefan

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