Common HTML Error and Status Codes
301 Moved Permanently
Search engines will update their cache and use the new returned URI for all future requests.
If you link to a page that returns this code, you should update your links. We periodically verify all links on our websites and update the external links. Conversely, if you maintain a site, provide a ‘permanent link’ or permlink, that users can link to.
302 Found
The equates to moved temporarily.
401 Unauthorized
Check your username and password is correct.