LayoutHeader is a form of the LayoutHeader Directive Family that inserts data at the end of the outbound stream after the document is displayed. LayoutHeader can be used in three different ways (the first two example cache the content in the Apache process).
<VirtualHost www.foo.com:80>
LayoutHeader "<H1>Welcome to company FooBar</H1>"
</VirtualHost>
<VirtualHost www.foo.com:80>
LayoutHeader /usr/local/apache/htdocs/header.html
</VirtualHost>
<VirtualHost www.foo.com:80>
LayoutHeader /Header.cgi
</VirtualHost>