It’s common for a client to send a request for a file that either does not exist on the server, or exists in a different location. This can occur for a variety of reasons. You might move your files around the server (or to a completely different server), or you may want to present a logical file system structure to connecting clients.
Normally, these actions result in error message, but Apache’s aliasing and redirection capabilities, available thanks to the mod_alias module, allow you to handle these scenarios by directing clients to the new resource location — via Nettuts+
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