Because my brain is a sieve here’s how to serve custom favicons based on the subdomain.

January 21st, 2010

The ability to serve, from the same code base, custom favicons based on subdomains came up recently and because my mod_write fu is about as strong as a water soaked kleenex I’m documenting just what the hell I did to get it working as a proof-of-concept.


RewriteEngine on
# This is just for troubleshooting purposes, comment it out
RewriteLog /var/log/apache2/rewrite.log
RewriteLogLevel 9


# Rewrite index.html to %2
RewriteRule ^/index.html$ /%2.html


# If the request is not for the the main domain or the www subdomain
RewriteCond %{HTTP_HOST} !^(www\.)?megafuntimefor\.us


# get the requested subdomain name into variable %2
RewriteCond %{HTTP_HOST} ^(www\.)?([^.]+)\.megafuntimefor\.us


RewriteRule ^/images/favicon.ico /images/%2.ico

Above is just the mod_rewrite block and while I’m sure that their is a drier way to write it I have yet to attain that level of enlightenment.

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