Need help to deal with poorly written PHP apps behind Apache used as Reverse Proxy

["Alan AZZERA" <azzera.alan@xxxxxxxxx>]

Hi world !

Here is my problem, I hope someone could help me.

I
need to host some web apps, coded in PHP by non-professional
developpers, and sometimes poorly written and designed. I use an Apache
server configured as a Reverse Proxy, my real HTTP server is behind
this R.P. I have two DNS zones, a public one and a private one. Here is
the chain :

1. Client's web browser asks for http://app.public.zone/
2. My Apache RP has a Virtual Host (ServerName app.public.zone) that catches the request, and (reverse)proxifies it to http://app.private.zone/
3. My Apache private server has a VirtualHost (Servername app.private.zone) that handles the request.

Everything works fine with well coded and designed PHP apps,
that make use of right Apache environment variables like
HTTP_X_FORWARDED_(HOST|SERVER). But apps that make use of SCRIPT_URI,
SERVER_NAME or HTTP_HOST cause troubles. I tried to handle these
troubles with mod_proxy_html, but I failed to configure it to rewrite
efficiently URL in CSS or _javascript_s. Desperate, I tried to handle
this with mod_rewrite and its [E=HTTP_HOST:
app.public.zone] feature in the VirtualHost app.private.zone. It failed
too.

Do
I miss something obvious ? Am I trying to solve problems the wrong way
? Since I am not far for being just a newbie, it is very possible... Would
anyone be keen enough to put me on the right way ?

Best regards,

Al.