class HTTPStatus:
    # ==========================
    # 2xx Success
    # ==========================
    OK = 200                      # Request successful
    CREATED = 201                 # Resource created successfully
    ACCEPTED = 202                # Request accepted for processing
    NO_CONTENT = 204              # Success, no response body

    # ==========================
    # 4xx Client Errors
    # ==========================
    BAD_REQUEST = 400             # Invalid request
    UNAUTHORIZED = 401            # Authentication required
    FORBIDDEN = 403               # Access denied
    NOT_FOUND = 404               # Resource not found
    METHOD_NOT_ALLOWED = 405      # HTTP method not allowed
    CONFLICT = 409                # Resource conflict (e.g., duplicate)
    UNPROCESSABLE_ENTITY = 422    # Validation error
    TOO_MANY_REQUESTS = 429       # Rate limit exceeded

    # ==========================
    # 5xx Server Errors
    # ==========================
    INTERNAL_SERVER_ERROR = 500   # Internal server error
    NOT_IMPLEMENTED = 501         # Feature not implemented
    BAD_GATEWAY = 502             # Invalid response from upstream server
    SERVICE_UNAVAILABLE = 503     # Server temporarily unavailable
    GATEWAY_TIMEOUT = 504         # Upstream server timeout