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

sock = listener.accept()[0]

            # Do the handshake: conn header, settings, send settings, recv ack.
            frame_buffer.add_data(receive_preamble(sock))

            # Now expect some data. One headers frame and one data frame.
            req_wait = True
            while req_wait:
                frame_buffer.add_data(sock.recv(65535))
                with reusable_frame_buffer(frame_buffer) as fr:
                    for f in fr:
                        if isinstance(f, DataFrame):
                            req_wait = False

            # Respond!
            h = HeadersFrame(1)
            h.data = self.get_encoder().encode(
                [
                    (':status', 200),
                    ('content-type', 'not/real'),
                    ('content-length', 20),
                ]
            )
            h.flags.add('END_HEADERS')
            sock.send(h.serialize())
            d = DataFrame(1)
            d.data = b'1234567890' * 2
            d.flags.add('END_STREAM')
            sock.send(d.serialize())

            # keep the socket open for clean shutdown
            recv_event.wait(5)

def add_headers_frame(self, stream_id, headers, end_block=True,
                          end_stream=False):
        frame = HeadersFrame(stream_id)
        frame.data = self.encoder.encode(headers)
        if end_block:
            frame.flags.add('END_HEADERS')
        if end_stream:
            frame.flags.add('END_STREAM')
        self.frames.append(frame)

def create_socket(status_code, data, headers):
        # test helper method
        encoder = Encoder()
        h1 = HeadersFrame(1)
        h1.data = encoder.encode(
            [(':status', status_code), ('content-length', len(data))] + headers
        )
        h1.flags |= set(['END_HEADERS'])

        d1 = DataFrame(1)
        d1.data = data

        d2 = DataFrame(1)
        d2.flags |= set(['END_STREAM'])

        content = b''.join(f.serialize() for f in [h1, d1, d2])
        buffer = BytesIO(content)

        return DummySocket(buffer)

def build_headers_frame(self,
                            headers,
                            flags=[],
                            stream_id=1,
                            **priority_kwargs):
        """
        Builds a single valid headers frame out of the contained headers.
        """
        f = HeadersFrame(stream_id)
        f.data = self.encoder.encode(headers)
        f.flags.add('END_HEADERS')
        for flag in flags:
            f.flags.add(flag)

        for k, v in priority_kwargs.items():
            setattr(f, k, v)

        return f

def build_headers_frame(headers, encoder=None):
    f = HeadersFrame(1)
    e = encoder
    if e is None:
        e = Encoder()
        e.huffman_coder = HuffmanEncoder(REQUEST_CODES, REQUEST_CODES_LENGTH)
    f.data = e.encode(headers)
    f.flags.add('END_HEADERS')
    return f

buffer.max_frame_size = 65535
        data = c.data_to_send()
        buffer.add_data(data[:-1])

        # Drain the buffer, confirming that it only provides a single frame
        # (the settings frame)
        assert len(list(buffer)) == 1

        # Get the cached frames.
        frames = buffer._headers_buffer

        # Split the frames up.
        headers_frame = frames[0]
        continuation_frames = frames[1:]

        assert isinstance(headers_frame, hyperframe.frame.HeadersFrame)
        assert all(
            map(
                lambda f: isinstance(f, hyperframe.frame.ContinuationFrame),
                continuation_frames)
        )
        assert all(
            map(lambda f: len(f.data) <= c.max_outbound_frame_size, frames)
        )

        assert frames[0].flags == {'END_STREAM'}

        buffer.add_data(data[-1:])
        headers = list(buffer)[0]
        assert isinstance(headers, hyperframe.frame.HeadersFrame)

def test_connection_window_increments_appropriately(self, frame_buffer):
        e = Encoder()
        h = HeadersFrame(1)
        h.data = e.encode([(':status', 200), ('content-type', 'foo/bar')])
        h.flags = set(['END_HEADERS'])
        d = DataFrame(1)
        d.data = b'hi there sir'
        d2 = DataFrame(1)
        d2.data = b'hi there sir again'
        d2.flags = set(['END_STREAM'])
        sock = DummySocket()
        sock.buffer = BytesIO(h.serialize() + d.serialize() + d2.serialize())

        c = HTTP20Connection('www.google.com')
        c._sock = sock
        c.window_manager.window_size = 1000
        c.window_manager.initial_window_size = 1000
        c.request('GET', '/')
        resp = c.get_response()

def test_read_headers_out_of_order(self):
        # If header blocks aren't decoded in the same order they're received,
        # regardless of the stream they belong to, the decoder state will
        # become corrupted.
        e = Encoder()
        h1 = HeadersFrame(1)
        h1.data = e.encode([(':status', 200), ('content-type', 'foo/bar')])
        h1.flags |= set(['END_HEADERS', 'END_STREAM'])
        h3 = HeadersFrame(3)
        h3.data = e.encode([(':status', 200), ('content-type', 'baz/qux')])
        h3.flags |= set(['END_HEADERS', 'END_STREAM'])
        sock = DummySocket()
        sock.buffer = BytesIO(h1.serialize() + h3.serialize())

        c = HTTP20Connection('www.google.com')
        c._sock = sock
        r1 = c.request('GET', '/a')
        r3 = c.request('GET', '/b')

        assert c.get_response(r3).headers == HTTPHeaderMap(
            [('content-type', 'baz/qux')]
        )
        assert c.get_response(r1).headers == HTTPHeaderMap(
            [('content-type', 'foo/bar')]
        )

flags = self.flag_byte

        header = _STRUCT_HBBBL.pack(
            (self.body_len >> 8) & 0xFFFF,  # Length spread over top 24 bits
            self.body_len & 0xFF,
            self.type,
            flags,
            self.stream_id & 0x7FFFFFFF  # Stream ID is 32 bits.
        )

        return header + self.body


_FRAME_CLASSES = [
    DataFrame,
    HeadersFrame,
    PriorityFrame,
    RstStreamFrame,
    SettingsFrame,
    PushPromiseFrame,
    PingFrame,
    GoAwayFrame,
    WindowUpdateFrame,
    ContinuationFrame,
    AltSvcFrame,
]
#: FRAMES maps the type byte for each frame to the class used to represent that
#: frame.
FRAMES = {cls.type: cls for cls in _FRAME_CLASSES}

def _receive_transmission(self, stream_id=None, include_body=True):
        if not include_body:
            raise NotImplementedError()

        body_expected = True

        header_blocks = b''
        body = b''

        while True:
            frm = self.read_frame()
            if (
                (isinstance(frm, hyperframe.frame.HeadersFrame) or isinstance(frm, hyperframe.frame.ContinuationFrame)) and
                (stream_id is None or frm.stream_id == stream_id)
            ):
                stream_id = frm.stream_id
                header_blocks += frm.data
                if 'END_STREAM' in frm.flags:
                    body_expected = False
                if 'END_HEADERS' in frm.flags:
                    break
            else:
                self._handle_unexpected_frame(frm)

        while body_expected:
            frm = self.read_frame()
            if isinstance(frm, hyperframe.frame.DataFrame) and frm.stream_id == stream_id:
                body += frm.data
                if 'END_STREAM' in frm.flags: