using mod_proxy and mod_substitute to replace code in https or redirect

I want to setup a free proxy but replace html code in each page in order to display a message/note to user in each visited page.

So far it works ok by this code in httpd.conf: This code replaces body with body2

The problem is that if I visit a https:// url it would not replace the html content, makes some sense because it should be encrypted.

But if there is no way to replace code in https request, is it possible to configure mod_proxy to redirect all https:// requests to http:// ?

ProxyRequests On
ProxyVia On

<Proxy "*">
</Proxy>


RequestHeader unset Accept-Encoding

AddOutputFilterByType SUBSTITUTE text/html

Substitute "s|body|body2|i"