Traffic from Internal to WAF

Hello People

I have Confluence configured in internal network and I use WAF to allow access from external. Currently I use plain HTTP so all connections from external are coming on port 80 and WAF redirects to port 8090

I have added following server configuration  proxyName="example.com" proxyPort="80"

Based on above configuration external connection works fine and users are able to add, edit, and save pages. Problem comes when confluence is accessed by internal users but from internal I cannot set WAF so currently they must access URL:8090

Issue is when they try to add, edit or save page and than error message shoes incorrect proxy configuration.  

Does anyone knows how to configure internal traffic so it is redirected as same way as incoming external through WAF 

Thanks,

Raf