Jira Header Menu sometimes disappearing with mod_proxy

[Christoph]

I configured my Jira instance behind an Apache with ssl enabled:

server.xml

scheme="https" proxyName="jira.xxx.com" proxyPort="443" secure="true"

 Apache:

ProxyRequests Off
ProxyPreserveHost On

ProxyPass / http://localhost:8090
ProxyPassReverse / http://localhost:8090

<Location />
   Require all granted
</Location>

 Everything seems to work but I do miss often the header menu (Dashboard Link, Issues-Link, Create Button etc). If I relaod the site permanently, the menu eventually appears again.

 Without Menu:

With Menu after several reloads:

What is here the cause? I checked everything a couple of times. Nothing helps so far.

Edit: I just noticed that also the sidebar is sometimes not appearing:

[Lars Olav Velle]

Do you see any errors when accessing jira with developer tools? Console/network

-Lars

[Christoph]

Hi Lars

thanks for the hint. The Google Page Speed module in Apache did somehow block the menu CSS file as far as I could see. With that module disabled, it seems to work.

Merci

[sobekfontys]

Yes, this solved the problem for me as well. I use an apache proxy with pagespeed enabled. Disabling it in e.g. 

/etc/apache2/mods_available/pagespeed.conf

ModPagespeed Off 

Did the job for me.