The Status-Code element is a 3-digit integer result code of the attempt to understand and satisfy the request. The Status-Code is intended for use by automata.

The first digit of the Status-Code defines the class of response. The last two digits do not have any categorization role. There are 5 values for the first digit:

• 1xx : Informational - Not used, but reserved for future use
• 2xx : Success - The action was successfully received, understood, and accepted.
• 3xx : Redirection - Further action must be taken in order to complete the request
• 4xx : Client Error - The request contains bad syntax or cannot be fulfilled
• 5xx : Server Error - The server failed to fulfill an apparently valid request