mod_proxy ProxyPassReverse incorrectly adjusting Location header in redirect?

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Hi, as an interim solution in an internal reorganization of server resources, I 
want to use mod_proxy as a reverse proxy to move the entire functionality of a 
public-facing server (www.example.com) to an internal server 
(internal.example.com).  (configuration at end)

https is used in this site only for logging in, after which a 302 redirect is 
issued pointing to http://www.example.com/home.html, and the session continues 
through http.  I am having trouble getting ProxyPassReverse to rewrite the 
Location header in the redirect properly.

Here's the sequence:
-client sends POST login credentials to https://www.example.com/login.html
-request is proxied by https://www.example.com to 
https://internal.example.com/login.html
-login succeeds, respond with 302 redirect to 
http://internal.example.com/home.html
-reply goes to https://www.example.com
- ******** ProxyPassReverse rewrites the Location header 
from http://internal.example.com/home.html to https://www.example.com/home.html
-reply received by client, which acts on the redirect

The starred ******* step is what is going wrong, as the proxy is changing the 
http to https despite the explicit "ProxyPassReverse / 
http://internal.example.com"; line.

I have tried many different tweaks to the configuration, but I always find that 
the header is rewritten back to https despite my explicitly specifying http in 
the response.

I feel like I must be misunderstanding something here.  Can anyone help me 
untangle it?

Regards,
Charlie Katz



configuration on www.example.com
<VirtualHost _default_:80>
  ProxyRequests off
  ProxyPass / http://internal.example.com/
  ProxyPassReverse / http://internal.example.com/
  ProxyPassReverse / https://internal.example.com/
  ProxyPassReverseCookieDomain internal.example.com www.example.com
</VirtualHost>

<VirtualHost _default_:443>
  SSLProxyEngine on

  ProxyRequests off
  ProxyPass / https://internal.example.com/
  ProxyPassReverse / http://internal.example.com/
#  ProxyPassReverse / https://internal.example.com/  # same behavior with or 
without this line
  ProxyPassReverseCookieDomain internal.example.com www.example.com
</VirtualHost>



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