Method check

src/websockets/frames.py:418–427

Check that the close code has a valid value for a close frame. Raises: ProtocolError: If the close code is invalid.

(self)

        return struct.pack("!H", self.code) + self.reason.encode()

    def check(self) -> None:
        """
        Check that the close code has a valid value for a close frame.

        Raises:
            ProtocolError: If the close code is invalid.

        """
        if not (self.code in EXTERNAL_CLOSE_CODES or 3000 <= self.code < 5000):
            raise ProtocolError("invalid status code")


# At the bottom to break import cycles created by type annotations.