[users@httpd] proxy urlmapping outside of the path

[Marc]

I have a config and actually only want to allow access to a specific path xxx 
of the proxied host nothing else. However that path on the proxied host is 
refering to files eg in the root

    ProxyPreserveHost Off
    ProxyAddHeaders On
    SetOutputFilter  proxy-html
    ProxyHTMLEnable On
    ProxyHTMLExtended On

    ProxyPass        "https://${proxyhost}/xxx";
    ProxyPassReverse "https://${proxyhost}/xxx";


    ProxyHTMLURLMap https://${proxyhost}/xxx https://${defaulthost}/aaa

I have such references to the proxied host in the website pages, links suchs as 
these:

<script src="https://proxyhost/js/";></script><script 
src="https://proxyhost/js/....s";></script><script 
src="https://proxyhost/js/.....js";></script><script 
src="https://proxyhost/js/..js";></script><script 
src="https://proxyhost/js/l....js";></script><script 
src="https://proxyhost/js/....";></script>

Any ideas what what would be a good method to handle these exceptions outside 
of the xxx path?