const HTTP_CONTINUE       = 100;
        const SWITCHING_PROTOCOLS = 101;
        const PROCESSING          = 102;
        const EARLY_HINTS         = 103;

        const OK                            = 200;
        const CREATED                       = 201;
        const ACCEPTED                      = 202;
        const NON_AUTHORITATIVE_INFORMATION = 203;
        const NO_CONTENT                    = 204;
        const RESET_CONTENT                 = 205;
        const PARTIAL_CONTENT               = 206;
        const MULTI_STATUS                  = 207;
        const IM_USED                       = 226;

        const MULTIPLE_CHOICES   = 300;
        const MOVED_PERMANENTLY  = 301;
        const FOUND              = 302;
        const SEE_OTHER          = 303;
        const NOT_MODIFIED       = 304;
        const USE_PROXY          = 305;
        const RESERVED           = 306;
        const TEMPORARY_REDIRECT = 307;
        const PERMANENT_REDIRECT = 308;

        const BAD_REQUEST                     = 400;
        const UNAUTHORIZED                    = 401;
        const PAYMENT_REQUIRED                = 402;
        const FORBIDDEN                       = 403;
        const NOT_FOUND                       = 404;
        const METHOD_NOT_ALLOWED              = 405;
        const NOT_ACCEPTABLE                  = 406;
        const PROXY_AUTHENTICATION_REQUIRED   = 407;
        const REQUEST_TIMEOUT                 = 408;
        const CONFLICT                        = 409;
        const GONE                            = 410;
        const LENGTH_REQUIRED                 = 411;
        const PRECONDITION_FAILED             = 412;
        const REQUEST_ENTITY_TOO_LARGE        = 413;
        const REQUEST_URI_TOO_LONG            = 414;
        const UNSUPPORTED_MEDIA_TYPE          = 415;
        const REQUESTED_RANGE_NOT_SATISFIABLE = 416;
        const EXPECTATION_FAILED              = 417;
        const IM_A_TEAPOT                     = 418;
        const MISDIRECTED_REQUEST             = 421;
        const UNPROCESSABLE_ENTITY            = 422;
        const LOCKED                          = 423;
        const FAILED_DEPENDENCY               = 424;
        const UPGRADE_REQUIRED                = 426;
        const PRECONDITION_REQUIRED           = 428;
        const TOO_MANY_REQUESTS               = 429;
        const REQUEST_HEADER_FIELDS_TOO_LARGE = 431;
        const UNAVAILABLE_FOR_LEGAL_REASONS   = 451;

        const INTERNAL_SERVER_ERROR           = 500;
        const NOT_IMPLEMENTED                 = 501;
        const BAD_GATEWAY                     = 502;
        const SERVICE_UNAVAILABLE             = 503;
        const GATEWAY_TIMEOUT                 = 504;
        const HTTP_VERSION_NOT_SUPPORTED      = 505;
        const VARIANT_ALSO_NEGOTIATES         = 506;
        const INSUFFICIENT_STORAGE            = 507;
        const NOT_EXTENDED                    = 510;
        const NETWORK_AUTHENTICATION_REQUIRED = 511;