Hash of HTTP status code => message. - *1xx*: Informational -- Request received, continuing process - *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 [See Also:] http://www.iana.org/assignments/http-status-codes/http-status-codes.xhtml