The Document contains the complete list of error codes

Every status code is a three digit number. The first digit defines how your server responded to the request. The last two digits do not have any categorization role. There are five values for the first digit:
1.    1xx: Informational-Not used, but reserved for future use
2.    2xx: Success-The action was successfully received, understood, and accepted.
3.    3xx: Redirection - Further action must be taken in order to complete the request
4.    4xx: Client Error - The request contains bad syntax or cannot be fulfilled.
5.    5xx: Server Error - The server failed to fulfill an apparently valid request.