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.htaccess: 301 Permanent Redirect
If the URL of a page is changed, a 301 permanent redirect should be created to point visitors to the new location and most importantly: help preserve existing search engine ranking.
Using .htaccess and mod_rewrite, 301 redirects can be easily created:
code snippet:
Options +FollowSymLinks
RewriteEngine on
RewriteRule ^oldpage.php http://example.com/newpage.html [R=301,L] 


