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From "Shane Smith" <>
Subject [users@httpd] ProxyPreserve... Port?
Date Tue, 09 May 2006 23:46:02 GMT
Hey Folks,

I'm using the proxy module, and I've run into one of those weird cases
as described in the documentation where the ProxyPreserveHost
Directive needs to be set true. (voicexml app) What it doesn't seem to
do (nor should it on it's own) is preserve the correct port address on
the request.  Is there any way to fake a ProxyPreservePort Directive,
or accomplish the same thing a different way?

Here's the skinny:

browser on 192.168.x.x network is requesting through a firewall, and
making it's http requests to a 192.168.x.x address.  The firewall
NAT's that to a 10.10.x.x address.  That 10.10.x.x address (my dev
desktop) answers the http request with an apache reverse proxy, making
it seem as if it's really a different server. (in this case, it's just
a different port)

So requests come in to my desktop on port 9980, which has the apache
reverse proxy set to pull from 9080.  Here is what's in my conf:

<VirtualHost *:9980>
<Proxy *>
Order deny,allow
Allow from all
ProxyRequests On
#ProxyPreserveHost On
ProxyPass /pizza/
ProxyPassReverse /pizza/

So 9980 in effect is pretending to be 9080, and everything works
great.  That is until, the application (that i don't have source for)
uses the http request to hardcode the server IP/Port address in the
http response body (untouchable by httpd)  Of course, the next fetch
from the browser will fail, since it's trying to access a 10.x address
instead of the correct 192.168 address.

Well, ProxyPreserveHost does the trick, and gets the correct IP
address to come thru in the response body, but not the correct port. 
What ends up happing is this:   When it should be

I hope I didn't lose everyone with the ports and numbers jargon.  The
reverse proxy functionality is very useful, so long as you are using
the same port number on both sides of the proxy. If you change this
port (which you have to for localhost)  then applications that insist
on specifying it's ip/port with absolute url's instead of using
relative url's will fail.  (i've flogged that dev team)

Any chance I can get a proxypreservePORT directive functionality, or
convince this dev team that this needs to be added?

Shane Smith

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