Linux.Apache
From Mike's Wiki
How to install mod_proxy_html in CentOS
1. Visit mod_proxy_html office site to download source code, or get the latest source code in subversion.
Here I checkout the latest source code (3.0):
#svn co http://apache.webthing.com/svn/apache/filters/proxy_html/ mod_proxy_html
2. Install necessary development packages:
#yum install httpd-devel libxml2-devel
3. Install in apxs:
#apxs -I /usr/include/libxml2 -c -i mod_proxy_html.c
4. Add necessary directives in httpd.conf:
LoadFile /usr/lib/libxml2.so
LoadModule proxy_html_module modules/mod_proxy_html.so
5. Restart httpd. Done.

