BUG or FEATURE? a reverse proxy question.

(my apologises if this question isn't in the write place)

Why isn't apache adjusting the URL before forwarding the HTTP redirect
response to the client?

Problem description:
According to httpd.conf file below, a local request to
is converted into a proxy request
. Until here everything is ok!

In backend server I have a page that contains a reference to some image,
(e.g.
).

I'm unable to see this image through a proxy request, because this reference
is being adjusted to
instead of .

#--- here is my httpd.conf file in frontend server ----
....

...
ProxyPassReverse /foo/ http://backend-server/

RewriteEngine On
RewriteRule ^/foo/(.*) http://backend-server/$1 [P]
...

#---

Thanks
Jose Pinto.

Re: BUG or FEATURE? a reverse proxy question.

you coluld solve the problem by using mod_rewrite and checking the referrer
for /foo/ ....

Manon

--On Donnerstag, 4. Juli 2002 16:32 Uhr +0100 PINTO Jose Silva
wrote:

> (my apologises if this question isn't in the write place)
>
> Why isn't apache adjusting the URL before forwarding the HTTP redirect
> response to the client?
>
> Problem description:
> According to httpd.conf file below, a local request to
> is converted into a proxy request
> . Until here everything is ok!
>
> In backend server I have a page that contains a reference to some image,
> (e.g.
> ).
>
> I'm unable to see this image through a proxy request, because this
> reference is being adjusted to
> instead of
> .
>
># --- here is my httpd.conf file in frontend server ----
> ...
>
> ...
> ProxyPassReverse /foo/ http://backend-server/
>
> RewriteEngine On
> RewriteRule ^/foo/(.*) http://backend-server/$1 [P]
> ...
>
># ---
>
> Thanks
> Jose Pinto.
>

Re: BUG or FEATURE? a reverse proxy question.

PINTO Jose Silva wrote:

> Why isn't apache adjusting the URL before forwarding the HTTP redirect
> response to the client?

It's not practical.

> Problem description:
> According to httpd.conf file below, a local request to
> is converted into a proxy request
> . Until here everything is ok!
>
> In backend server I have a page that contains a reference to some image,
> (e.g.
> ).
>
> I'm unable to see this image through a proxy request, because this reference
> is being adjusted to
> instead of .

This is because Apache only fiddles with the header of the request, not
the content of the body.

Trying to parse the body of a response to detect and change URLs is far
too expensive and error prone to be practical. Rather stick to relative
links (../image-dir/some-image.gif) or keep the URL space on the backend
the same as the URL space on the frontend (ie host it on
http://backend/foo/ instead of http://backend/).

Regards,
Graham
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