Spring Cloud Gateway in AWS not routing correctly

Question

I have created a simple REST service as below:

@RestController
public class ServiceController {

    @GetMapping(value = "/getSimpleResponse")
    public ResponseEntity<String> getSimpleResponse() {
        return new ResponseEntity<>("Hello from Service 1", HttpStatus.OK);
    }
}

I deploy this to AWS elastic beanstalk and is working fine. Here: Service 1 in AWS

Now I create a Spring Cloud Gateway service with route configuration as below:

@Configuration
public class GatewayConfig {
    @Bean
    public RouteLocator gatewayRoutes(RouteLocatorBuilder builder) {
        return builder.routes()
                .route(getFirstTestServiceRoute())
                .build();
    }

    private Function<PredicateSpec, Route.AsyncBuilder> getFirstTestServiceRoute() {
        return p -> p
                .path("/service1/**")
                .uri("http://testservice1-env.qgwe5a4qq8.ap-south-1.elasticbeanstalk.com/")
                .id("service1");
    }
}

I Deploy the Gateway Application in AWS Elastic beanstalk here.

But the GatewayURL/service1/getSimpleResponse returns a Whitelabel Error Page. I was expecting the same output as Service 1. What am I doing wrong?

Answer 1

I was missing RequestMapping at the class level. My URL format is

GatewayURL/service1/getSimpleResponse

I assume this is because the Spring Cloud Gateway is probably appending the complete path(/service1/getSimpleResponse) to the downstream service URL

 @RestController
    @RequestMapping("/service1")
    public class ServiceController {

        @GetMapping(value = "/getSimpleResponse")
        public ResponseEntity<String> getSimpleResponse() {
            return new ResponseEntity<>("Hello from Service 1", HttpStatus.OK);
        }
    }