Silent no-www flamboyancy

The whole www. or no-www. flamboywar is a bit dull. Anyhow, here is a tip that will configure Apache to inform users and search engines about the preferred location (aka. domain) of webpages.

Content-Location is a header from the HTTP standard that is intended to inform users about an alternate location of a resource without redirecting them.

The below scrip is placed in Apache’s /.htaccess configuration file. Apache 2.2.4 or newer required.

SetEnv absolutehost http://domain.tld/
SetEnvIfNoCase Host ^domain.tld$ absolutehosttrue=yes
SetEnvIfNoCase Request_URI \/(.*)\..* requesturi=$1
Header always unset Content-Location
Header always set Content-Location %{absolutehost}e%{requesturi}e env=!absolutehosttrue

To sum up what it does: It first stores the absolute host (domain name) in two enviromental variables. Then it checks whether the request was made from the absolute host or not, before it first unsets the Content-Location header and then sets the new header if the request was made from any host but the preferred host. Voila.

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