枚举值:100 CONTINUE101 SWITCHING_PROTOCOLS102 PROCESSING103 CHECKPOINT200 OK201 CREATED202 ACCEPTED203 NON_AUTHORITATIVE_INFORMATION204 NO_CONTENT205 RESET_CONTENT206 PARTIAL_CONTENT207 MULTI_STATUS208 ALREADY_REPORTED226 IM_USED300 MULTIPLE_CHOICES301 MOVED_PERMANENTLY302 FOUND302 MOVED_TEMPORARILY303 SEE_OTHER304 NOT_MODIFIED305 USE_PROXY307 TEMPORARY_REDIRECT308 PERMANENT_REDIRECT400 BAD_REQUEST401 UNAUTHORIZED402 PAYMENT_REQUIRED403 FORBIDDEN404 NOT_FOUND405 METHOD_NOT_ALLOWED406 NOT_ACCEPTABLE407 PROXY_AUTHENTICATION_REQUIRED408 REQUEST_TIMEOUT409 CONFLICT410 GONE411 LENGTH_REQUIRED412 PRECONDITION_FAILED413 PAYLOAD_TOO_LARGE413 REQUEST_ENTITY_TOO_LARGE414 URI_TOO_LONG414 REQUEST_URI_TOO_LONG415 UNSUPPORTED_MEDIA_TYPE416 REQUESTED_RANGE_NOT_SATISFIABLE417 EXPECTATION_FAILED418 I_AM_A_TEAPOT419 INSUFFICIENT_SPACE_ON_RESOURCE420 METHOD_FAILURE421 DESTINATION_LOCKED422 UNPROCESSABLE_ENTITY423 LOCKED424 FAILED_DEPENDENCY426 UPGRADE_REQUIRED428 PRECONDITION_REQUIRED429 TOO_MANY_REQUESTS431 REQUEST_HEADER_FIELDS_TOO_LARGE451 UNAVAILABLE_FOR_LEGAL_REASONS500 INTERNAL_SERVER_ERROR501 NOT_IMPLEMENTED502 BAD_GATEWAY503 SERVICE_UNAVAILABLE504 GATEWAY_TIMEOUT505 HTTP_VERSION_NOT_SUPPORTED506 VARIANT_ALSO_NEGOTIATES507 INSUFFICIENT_STORAGE508 LOOP_DETECTED509 BANDWIDTH_LIMIT_EXCEEDED510 NOT_EXTENDED511 NETWORK_AUTHENTICATION_REQUIRED