Is it possible to the configure the proxy module of apache2 to fetch the origin with the same IP address the the request was sent to?

Question

The scenario:

I have one physical server with multiple ip addresses.

Lets say:

• 1.1.1.1
• 1.1.1.2
• 1.1.1.3

It runs apache2 and is configured as forward proxy.

Now if I a client makes a request to example.com using the ip address 1.1.1.1 as proxy, the server should fetch the data from example.com exposing this ip.

However if a client has configured 1.1.1.2 as IP address, this ip should be used to make the request.

I currently have set up proxmox ve and run several virtual instances on that box with one IP and one apache2 instance each. I want to get rid of that overhead.

I know that I can put a <Proxy> statement into a <VirtualHost> container.

Currently my my test environment ist listening on all IP adresses, and proxy requests work on every address. However the origin fetch is always done using the first address.

I tried something similar to this:

<VirtualHost 1.1.1.1:80>
        ProxyRequests On
        <Proxy *>
                Order deny,allow
                Deny from all
                Allow from ...
        </Proxy>
</VirtualHost>
<VirtualHost 1.1.1.2:80>
        ProxyRequests On
        <Proxy *>
                Order deny,allow
                Deny from all
                Allow from ...
        </Proxy>
</VirtualHost>

But something seems not to be working.. Can somebody point me in the right direction?