How to use the awscrt.http.HttpProxyOptions function in awscrt

def test_proxy_http(self):
        proxy_options = HttpProxyOptions(host_name=PROXY_HOST, port=PROXY_PORT)
        self._test_get(secure=False, proxy_options=proxy_options)

def test_websockets_proxy(self):
        config = Config.get()
        elg = EventLoopGroup()
        resolver = DefaultHostResolver(elg)
        bootstrap = ClientBootstrap(elg, resolver)
        cred_provider = AwsCredentialsProvider.new_default_chain(bootstrap)
        connection = awsiot_mqtt_connection_builder.websockets_with_default_aws_signing(
            credentials_provider=cred_provider,
            websocket_proxy_options=HttpProxyOptions(PROXY_HOST, PROXY_PORT),
            endpoint=config.endpoint,
            region=config.region,
            client_id=create_client_id(),
            client_bootstrap=bootstrap)
        self._test_connection(connection)

socket_options=None,
            tls_connection_options=None,
            proxy_options=None):
        """
        Initiates a new connection to host_name and port using socket_options and tls_connection_options if supplied.
        if tls_connection_options is None, then the connection will be attempted over plain-text.

        Returns a future where the result is a new instance to HttpClientConnection, once the connection has completed
        and is ready for use.
        """
        assert isinstance(bootstrap, ClientBootstrap) or bootstrap is None
        assert isinstance_str(host_name)
        assert isinstance(port, int)
        assert isinstance(tls_connection_options, TlsConnectionOptions) or tls_connection_options is None
        assert isinstance(socket_options, SocketOptions) or socket_options is None
        assert isinstance(proxy_options, HttpProxyOptions) or proxy_options is None

        future = Future()
        try:
            if not socket_options:
                socket_options = SocketOptions()

            if not bootstrap:
                event_loop_group = EventLoopGroup(1)
                host_resolver = DefaultHostResolver(event_loop_group)
                bootstrap = ClientBootstrap(event_loop_group, host_resolver)

            connection = cls()
            connection._host_name = host_name
            connection._port = port

            def on_connection_setup(binding, error_code):

websocket_handshake_transform: optional function to transform websocket handshake request.
                    If provided, function is called each time a websocket connection is attempted.
                    The function may modify the request before it is sent to the server.
                    See WebsocketHandshakeTransformArgs for more info.
                    Function should take the following arguments and return nothing:
                        transform_args (WebsocketHandshakeTransformArgs): Contains request to be transformed.
                                Function must call transform_args.done() when complete.
                        **kwargs (dict): Forward-compatibility kwargs.
        """

        assert isinstance(client, Client)
        assert callable(on_connection_interrupted) or on_connection_interrupted is None
        assert callable(on_connection_resumed) or on_connection_resumed is None
        assert isinstance(will, Will) or will is None
        assert isinstance(socket_options, SocketOptions) or socket_options is None
        assert isinstance(websocket_proxy_options, HttpProxyOptions) or websocket_proxy_options is None
        assert callable(websocket_handshake_transform) or websocket_handshake_transform is None

        super(Connection, self).__init__()

        # init-only
        self.client = client
        self._on_connection_interrupted_cb = on_connection_interrupted
        self._on_connection_resumed_cb = on_connection_resumed
        self._use_websockets = use_websockets
        self._ws_handshake_transform_cb = websocket_handshake_transform

        # may be changed at runtime, take effect the the next time connect/reconnect occurs
        self.client_id = client_id
        self.host_name = host_name
        self.port = port
        self.clean_session = clean_session

print("Received message from topic '{}': {}".format(topic, payload))
    global received_count
    received_count += 1
    if received_count == args.count:
        received_all_event.set()

if __name__ == '__main__':
    # Spin up resources
    event_loop_group = io.EventLoopGroup(1)
    host_resolver = io.DefaultHostResolver(event_loop_group)
    client_bootstrap = io.ClientBootstrap(event_loop_group, host_resolver)

    if args.use_websocket == True:
        proxy_options = None
        if (args.proxy_host):
            proxy_options = http.HttpProxyOptions(host_name=args.proxy_host, port=args.proxy_port)

        credentials_provider = auth.AwsCredentialsProvider.new_default_chain(client_bootstrap)
        mqtt_connection = mqtt_connection_builder.websockets_with_default_aws_signing(
            endpoint=args.endpoint,
            client_bootstrap=client_bootstrap,
            region=args.signing_region,
            credentials_provider=credentials_provider,
            websocket_proxy_options=proxy_options,
            ca_filepath=args.root_ca,
            on_connection_interrupted=on_connection_interrupted,
            on_connection_resumed=on_connection_resumed,
            client_id=args.client_id,
            clean_session=False,
            keep_alive_secs=6)

    else:

if registerThingResponse is not None:
            break
        loopCount += 1
        print('Waiting... RegisterThingResponse: ' + json.dumps(registerThingResponse))
        time.sleep(1)

if __name__ == '__main__':
    # Spin up resources
    event_loop_group = io.EventLoopGroup(1)
    host_resolver = io.DefaultHostResolver(event_loop_group)
    client_bootstrap = io.ClientBootstrap(event_loop_group, host_resolver)

    if args.use_websocket == True:
        proxy_options = None
        if (args.proxy_host):
            proxy_options = http.HttpProxyOptions(host_name=args.proxy_host, port=args.proxy_port)

        credentials_provider = auth.AwsCredentialsProvider.new_default_chain(client_bootstrap)
        mqtt_connection = mqtt_connection_builder.websockets_with_default_aws_signing(
            endpoint=args.endpoint,
            client_bootstrap=client_bootstrap,
            region=args.signing_region,
            credentials_provider=credentials_provider,
            websocket_proxy_options=proxy_options,
            on_connection_interrupted=on_connection_interrupted,
            on_connection_resumed=on_connection_resumed,
            ca_filepath=args.root_ca,
            client_id=args.client_id,
            clean_session=False,
            keep_alive_secs=6)

    else:

if __name__ == '__main__':
    # Process input args
    args = parser.parse_args()
    thing_name = args.thing_name
    io.init_logging(getattr(io.LogLevel, args.verbosity), 'stderr')

    # Spin up resources
    event_loop_group = io.EventLoopGroup(1)
    host_resolver = io.DefaultHostResolver(event_loop_group)
    client_bootstrap = io.ClientBootstrap(event_loop_group, host_resolver)

    if args.use_websocket == True:
        proxy_options = None
        if (args.proxy_host):
            proxy_options = http.HttpProxyOptions(host_name=args.proxy_host, port=args.proxy_port)

        credentials_provider = auth.AwsCredentialsProvider.new_default_chain(client_bootstrap)
        mqtt_connection = mqtt_connection_builder.websockets_with_default_aws_signing(
            endpoint=args.endpoint,
            client_bootstrap=client_bootstrap,
            region=args.signing_region,
            credentials_provider=credentials_provider,
            websocket_proxy_options=proxy_options,
            ca_filepath=args.root_ca,
            client_id=args.client_id,
            clean_session=False,
            keep_alive_secs=6)

    else:
        mqtt_connection = mqtt_connection_builder.mtls_from_path(
            endpoint=args.endpoint,

if __name__ == '__main__':
    # Process input args
    args = parser.parse_args()
    thing_name = args.thing_name
    shadow_property = args.shadow_property
    io.init_logging(getattr(io.LogLevel, args.verbosity), 'stderr')

    # Spin up resources
    event_loop_group = io.EventLoopGroup(1)
    host_resolver = io.DefaultHostResolver(event_loop_group)
    client_bootstrap = io.ClientBootstrap(event_loop_group, host_resolver)

    if args.use_websocket == True:
        proxy_options = None
        if (args.proxy_host):
            proxy_options = http.HttpProxyOptions(host_name=args.proxy_host, port=args.proxy_port)

        credentials_provider = auth.AwsCredentialsProvider.new_default_chain(client_bootstrap)
        mqtt_connection = mqtt_connection_builder.websockets_with_default_aws_signing(
            endpoint=args.endpoint,
            client_bootstrap=client_bootstrap,
            region=args.signing_region,
            credentials_provider=credentials_provider,
            websocket_proxy_options=proxy_options,
            ca_filepath=args.root_ca,
            client_id=args.client_id,
            clean_session=False,
            keep_alive_secs=6)

    else:
        mqtt_connection = mqtt_connection_builder.mtls_from_path(
            endpoint=args.endpoint,