Apache with mod_security-dev No protocol handler was valid for the URL
I have a problem with Apache with mod_security-dev. I get the following error in the Http error logs:
[pid 32258:tid 34565337088] [client CLIENTIP:41490] AH01144: No protocol handler was valid for the URL /ajax/stayalive.php. If you are using a DSO version of mod_proxy, make sure the proxy submodules are included in the configuration using LoadModule., referer: http://URL/
Had the same issue and this worked for me:
Make sure the Backend Path path contains a slash and isnt empty in the Location(s) tab.
And in apache conf, it looks like the below in /usr/pbi/proxy_mod_security-amd64/local/etc/apache24/Includes/virtualhosts.conf.
This didnt work: