Comment 6 for bug 1405424

Thank you. It looks like it was fixed in 16.04:

# dpkg-query -L apache2-bin | grep mod_xml
/usr/lib/apache2/modules/mod_xml2enc.so

The dependency isn't automatic in 16.04:

# a2enmod proxy_html
Considering dependency proxy for proxy_html:
Enabling module proxy.
Enabling module proxy_html.
To activate the new configuration, you need to run:
  service apache2 restart

But you can enable it manually:

# a2enmod xml2enc
Enabling module xml2enc.
To activate the new configuration, you need to run:
  service apache2 restart