How to use the hyperframe.frame.ContinuationFrame function in hyperframe

def test_continuation_frame_flags(self):
        f = ContinuationFrame(1)
        flags = f.parse_flags(0xFF)

        assert flags == set(['END_HEADERS'])

def build_continuation_frame(self, header_block, flags=[], stream_id=1):
        """
        Builds a single continuation frame out of the binary header block.
        """
        f = ContinuationFrame(stream_id)
        f.data = header_block
        f.flags = set(flags)

        return f

self._inbound_flow_control_window_manager = WindowManager(
            max_window_size=self.local_settings.initial_window_size
        )

        # When in doubt use dict-dispatch.
        self._frame_dispatch_table = {
            HeadersFrame: self._receive_headers_frame,
            PushPromiseFrame: self._receive_push_promise_frame,
            SettingsFrame: self._receive_settings_frame,
            DataFrame: self._receive_data_frame,
            WindowUpdateFrame: self._receive_window_update_frame,
            PingFrame: self._receive_ping_frame,
            RstStreamFrame: self._receive_rst_stream_frame,
            PriorityFrame: self._receive_priority_frame,
            GoAwayFrame: self._receive_goaway_frame,
            ContinuationFrame: self._receive_naked_continuation,
            AltSvcFrame: self._receive_alt_svc_frame,
            ExtensionFrame: self._receive_unknown_frame
        }

# Slice into blocks of max_outbound_frame_size. Be careful with this:
        # it only works right because we never send padded frames or priority
        # information on the frames. Revisit this if we do.
        header_blocks = [
            encoded_headers[i:i+self.max_outbound_frame_size]
            for i in range(
                0, len(encoded_headers), self.max_outbound_frame_size
            )
        ]

        frames = []
        first_frame.data = header_blocks[0]
        frames.append(first_frame)

        for block in header_blocks[1:]:
            cf = ContinuationFrame(self.stream_id)
            cf.data = block
            frames.append(cf)

        frames[-1].flags.add('END_HEADERS')
        return frames

# Slice into blocks of max_outbound_frame_size. Be careful with this:
        # it only works right because we never send padded frames or priority
        # information on the frames. Revisit this if we do.
        header_blocks = [
            encoded_headers[i:i+self.max_outbound_frame_size]
            for i in range(
                0, len(encoded_headers), self.max_outbound_frame_size
            )
        ]

        frames = []
        first_frame.data = header_blocks[0]
        frames.append(first_frame)

        for block in header_blocks[1:]:
            cf = ContinuationFrame(self.stream_id)
            cf.data = block
            frames.append(cf)

        frames[-1].flags.add('END_HEADERS')
        return frames

# Slice into blocks of max_outbound_frame_size. Be careful with this:
        # it only works right because we never send padded frames or priority
        # information on the frames. Revisit this if we do.
        header_blocks = [
            encoded_headers[i:i+self.max_outbound_frame_size]
            for i in range(
                0, len(encoded_headers), self.max_outbound_frame_size
            )
        ]

        frames = []
        first_frame.data = header_blocks[0]
        frames.append(first_frame)

        for block in header_blocks[1:]:
            cf = ContinuationFrame(self.stream_id)
            cf.data = block
            frames.append(cf)

        frames[-1].flags.add('END_HEADERS')
        return frames

def frame_cls(chunks):
            for i in chunks:
                if i == 0:
                    yield hyperframe.frame.HeadersFrame, i
                else:
                    yield hyperframe.frame.ContinuationFrame, i

def _update_header_buffer(self, f):
        """
        Updates the internal header buffer. Returns a frame that should replace
        the current one. May throw exceptions if this frame is invalid.
        """
        # Check if we're in the middle of a headers block. If we are, this
        # frame *must* be a CONTINUATION frame with the same stream ID as the
        # leading HEADERS or PUSH_PROMISE frame. Anything else is a
        # ProtocolError. If the frame *is* valid, append it to the header
        # buffer.
        if self._headers_buffer:
            stream_id = self._headers_buffer[0].stream_id
            valid_frame = (
                f is not None and
                isinstance(f, ContinuationFrame) and
                f.stream_id == stream_id
            )
            if not valid_frame:
                raise ProtocolError("Invalid frame during header block.")

            # Append the frame to the buffer.
            self._headers_buffer.append(f)
            if len(self._headers_buffer) > CONTINUATION_BACKLOG:
                raise ProtocolError("Too many continuation frames received.")

            # If this is the end of the header block, then we want to build a
            # mutant HEADERS frame that's massive. Use the original one we got,
            # then set END_HEADERS and set its data appopriately. If it's not
            # the end of the block, lose the current frame: we can't yield it.
            if 'END_HEADERS' in f.flags:
                f = self._headers_buffer[0]