Search Engine Marketing Glossary

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301 Redirect – A message that the URL has moved permanently. This is commonly used when a URL has a new location and will not be appearing again at the old URL.

302 Redirect – A “found” message. (Also referred to as a “temporary redirect.”) This form of redirection is commonly used -- and in some cases abused -- when a URL has been moved to a different location; but, it will be returning to the original location eventually.

403 Server Code – A “forbidden” message. Prevents access to a URL and displays the reason for preventing access.

404 Server Code – A “not found” message. Server cannot find the URL requested.