Download mod_proxy_html.c from here (please remember to register if you use this software).
Compile it like so
apxs -a -c -I/usr/include/libxml2 -i mod_proxy_html.c
Create a file /etc/httpd/conf.d/mod_proxy_html.conf
LoadFile /usr/lib/libxml2.so
LoadModule proxy_html_module /usr/lib/httpd/modules/mod_proxy_html.so
ProxyHTMLExtended On
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