List of HTTP status codes - Wikipedia
https://en.wikipedia.org/wiki/List_of_HTTP_status_codes
This class of status code is intended for situations in which the error seems to have been caused by the client. Except when responding to a HEAD request, the server should include an entity containing an explanation of the error situation, and whether it is a temporary or permanent condition. These status codes are applicable to any request method. User agents should display any i…
DA: 71 PA: 94 MOZ Rank: 91