消息标头是 Spring 带有子流的集成流

Question

There is below main Spring Integration flow that receives the request through HTTP, handle it using several subflows and then replies to the consumer. The problem is that when the flow enters the first subflow, it loses practically all its headers including reply channel.

I want to know to what point the headers from the request should reach? to the end of the flow(RESPONSE_CHANNEL)? And how to avoid losing headers after entering subflow?

@Bean
public IntegrationFlow exampleFlow() {
  return IntegrationFlows.from(
      Http.inboundGateway("/conversions/lower")
          .requestMapping(r -> r.methods(HttpMethod.POST)
          .mappedRequestHeaders("*") 
          .requestPayloadType(Foo.class)
          .replyChannel(RESPONSE_CHANNEL)
          .mappedResponseHeaders("*")
        )
      .transform(this:transforFoo)
      .channel(CHANNEL1)
      .handle(fooFlowConfiguration.flowHandler())
//several handlers in another subflow 
      .channel(RESPONSE_CHANNEL)
      .get();
}

I tried to enrich headers before the end of the flow, but it does not help And tried to add.mappedResponseHeaders("*")

Answer 1

I think you just move to .channel(CHANNEL1).

And this part doesn't work:

handle(fooFlowConfiguration.flowHandler())
//several handlers in another subflow 
      .channel(RESPONSE_CHANNEL)

This one .replyChannel(RESPONSE_CHANNEL) I think for outbound gateway.

As I know the http gateway works in sync and just return last flow value. In your case its CHANNEL1 last step