[users@httpd] ProxyPass/ProxyPassReverse switch from http to https on redirect? (Apache 2.2.0)

[Kresimir Peharda <kp...@yahoo.com>]

I am struggling to set up a reverse proxy, and for some reason, just can't get
it right. 

I have a public server (will call it "frontend") to access a private one
("backend"). The "backend" sends a couple of redirects, which seem to confuse
the ProxyPassReverse, so eventually my browser ends up querying the DNS for the
whereabouts of the "backend". Namely, it goes like this:

In httpd.conf:
<Location /b-end/>
    ProxyPass http://backend/
    ProxyPassReverse http://backend/
</Location>

This has for effect that a request to:
Host: frontend
GET /b-end/ HTTP 1.1 

- gets forwarded to the backend, and a reply to the browser is rewritten like:
HTTP 1.1 302
Location: http://frontend/b-end/Login/

Now, the browser tries:
Host: frontend
GET /b-end/Login/ HTTP 1.1 - so far, so good

- and the proxy replies with:
HTTP 1.1 302
Location: http://frontend/b-end/Login/ - and this is wrong, since the proxy
actually gets that the document moved to https://backend/Login/, hence the
location should be rewritten like - https://frontend/b-end/Login/. However, it
always remain http.

I tried rewriting it to /sb-end/ with a directive:

ProxyPassReverse /sb-end/ https://backend/ - but I still get

Location: http://frontend/sb-end/Login/ - where I hoped it to be
https://frontend/sb-end/Login/

Needless to say, I tried a number of other tricks, including mod_ext_filter,
mod_rewrite, however, with no result.

I would sure like to understand what am I doing wrong.

Thanks in advance,
Kresimir

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