One of my sites has a list of FileMaker Pro custom functions, and the actual URLs are big & ugly like this: http://www.briandunning.com/filemaker-custom-functions/detail.php?fn_id=381 Code (markup): I'm using mod_rewrite to redirect them to a friendly URL, since people tend to post and email these pages a lot: http://www.briandunning.com/cf/381 Code (markup): This is the code I use to do the rewrite in .htaccess: RewriteRule ^cf/(.*)$ /filemaker-custom-functions/detail.php?fn_id=$1 [L] Code (markup): Note that I'm not sending a 301 or a 302, and I can see by using Firefox that the client receives a 200. My question is pretty general: is there anything wrong with doing it this way, as far as getting the friendly URL indexed? Duplicate content penalty since both URLs still work? Anything else?