Add the 'echo' option to mod_headers Header directive. Use the new option

like this:

Header echo regex

If a header received on a request matches regex, it is copied to the response
headers.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@89250 13f79535-47bb-0310-9956-ffa450edef68