如何从我的IntegrationFlow发送HTTP请求？

我从客户端收到一个请求，该请求返回一个SendRequest-Object，该对象具有HttpMethod，要发送的路径和数据。现在，我想根据获取到API的对象来发送请求。

发送后，我将收到回复。

现在的问题是如何发送有效载荷并接收响应。

@Bean
    public IntegrationFlow httpPostSendRawData() {
        return IntegrationFlows.from(
                Http.inboundGateway("/api/data/send")
                        .requestMapping(r -> r.methods(HttpMethod.POST))
                        .statusCodeExpression(dataParser().parseExpression("T(org.springframework.http.HttpStatus).BAD_REQUEST"))
                        .requestPayloadType(ResolvableType.forClass(DataSend.class))
                        .crossOrigin(cors -> cors.origin("*"))
                        .headerMapper(dataHeaderMapper())
        )
                .channel("http.data.send.channel")
                .handle("rawDataEndpoint", "send")
                .transform(/* here i have some transformations*/)
                .handle(Http.outboundGateway((Message<SendRequest> r)->r.getPayload().getPath())
                        .httpMethod(/* Here I would like to get the Method of SendRequest*/)
                        //add payload
                        .extractPayload(true))
.get();