The command $ sudo apt-get install libapache2-mod-proxy-html and then $sudo service apache2 restart fires:
apache2: Syntax error on line 210 of /etc/apache2/apache2.conf: Syntax
error on line 1 of /etc/apache2/mods-enabled/proxy_html.load: Cannot
load /usr/lib/libxml2.so.2 into server: /usr/lib/libxml2.so.2: cannot
open shared object file: No such file or directory Action 'configtest'
failed.
because 3.0.1 is buggy and apt-get offers only buggy version. So I am forced to manual install this here but it ends up to Unpacked mode (seen with $ dpkg -l|grep html). Some discussion here and more here.
The bug is also fixed in Debian: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=670633
How to fix this? How to apply the patch/fix now so I can proceed?