I'm trying to get the full ResponseEntity<String> from a REST call to a server.
The rest controller of the server looks like this:
@PostMapping(consumes = { "application/json;charset=UTF-8" })
public ResponseEntity<String> post(@Validated @RequestBody final SomeParam param) {
final String output = service.doStuff(param);
return ResponseEntity.ok(output);
}
I'm pretty confident I'm getting the ResponseEntity<String> back this way.
Now lets see what I have on the receiving end. The client looks like this:
@MessagingGateway
public interface MyClient {
@Gateway(requestChannel = ClientConfiguration.REQUEST_CHANNEL, replyChannel = ClientConfiguration.REPLY_CHANNEL)
ResponseEntity<String> makePost(@Header("url") String url, @Payload SomeParam param);
}
The ClientConfiguration of course:
public class ClientConfiguration{
static final String REQUEST_CHANNEL = "requestChannel";
static final String REPLY_CHANNEL = "replyChannel";
@Bean(name = REQUEST_CHANNEL)
MessageChannel requestChannel() {
return MessageChannels.direct(RENDERER_REQUEST_CHANNEL).get();
}
@Bean(name = REPLY_CHANNEL)
MessageChannel replyChannel() {
return MessageChannels.direct(RENDERER_REPLY_CHANNEL).get();
}
@Bean
MessageChannel channel() {
return MessageChannels.direct().get();
}
@Bean
IntegrationFlow channelFlow() {
return IntegrationFlows.from(channel())
.handle(Http.outboundGateway("url", new RestTemplate())
.charset("UTF-8"))
.channel(replyChannel())
.get();
}
}
With this setup I end up getting an empty ResponseEntity<String>. I printed it:
<200,[Date:"Wed, 31 Mar 2021 15:53:22 GMT", Content-Type:"text/html;charset=utf-8", Content-Length:"8732"]>
It looks fine but the body is however empty. I printed that one also out and it was null (and hasBody() = false)
I've experimented quite a bit without luck. Getting the payload only (so only the String of the ResponseEntity<String>) is quit easy as it seems is the standard usage. I just change the return type in my Client from ResponseEntity<String> to String and add the expectedResponseType as being a String in my integration flow as follows, and I get the payload just fine:
IntegrationFlow channelFlow() {
return IntegrationFlows.from(channel())
.handle(Http.outboundGateway("url", new RestTemplate())
.charset("UTF-8")
.expectedResponseType(String.class)) // <- this
.channel(replyChannel())
.get();
}
So it seems I can get the ResponseEntity without the body or just the body, but never both. What am I doing wrong?
