ISAPI Rewrite Tip #1

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Redirect Sub-Domain to Domain

For those of you utilizing an ISAPI filter for URI rewriting, here is a quick tip on setting up a 301 Moved Permanently rule for http://example.com/ to http://www.example.com/.

RewriteCond Host: ^example\.com 
RewriteRule (.*) http\://www\.example\.com$1 [I,RP]

Just drop the above rule into your httpd.ini file. No longer do you need to get your hosting provider involved when setting up 301 Moved Permanently redirects.

Be sure to always check your Server Headers to make sure that the correct HTTP Status Codes are being returned.