LayoutMerge
Description
When LayoutMerge is enabled Mod_Layout will attempt to merge
the contents of the header and footer with the original request.
Read the docs on LayoutMergeEndTag and LayoutMergeBeginTag to
understand how the tags are determined.
This was added in 2.7.2.
Example
<VirtualHost www.foo.com:80>
LayoutMerge Off
</VirtualHost>