Spring Cloud Openfeign Absolute URL for feign client stopped working in Spring Cloud Hoxton.RELEASE

FeignClient with absolute URL doesn't work using Spring Cloud Loadbalancer in Hoxton.RELEASE

With Spring Cloud Hoxton.RELEASE, FeignClient with ribbon disabled stopped respecting Absolute URLs.

FeignClient

@FeignClient(name = "feedback-client", url = "http://some.absolute.url") 
interface FeedbackClient {

   @RequestMapping(value = ["/feedback"], method = [RequestMethod.GET])
   fun findAll(@RequestParam("page") page: Int): Page<Feedback>
}

application.yml

spring:
  cloud:
    loadbalancer:
      ribbon:
        enabled: false

Error: s.c.o.l.FeignBlockingLoadBalancerClient : Load balancer does not contain an instance for the service <absolute http url>

Dependencies: - Spring Boot 2.2.1 - Spring Cloud Hoxton.RELEASE

Github Repo to reproduce the scenario:

https://github.com/cancerian0684/demo-openfeign

Stackoverflow thread:

https://stackoverflow.com/questions/59115379/feignclient-with-absolute-url-doesnt-work-using-spring-cloud-loadbalancer-in-ho

Comment From: echooymxq

Yes, there is a bug, when the url is not null, should get the FeignBlockingLoadBalancerClient delegate.

Comment From: nickcodefresh

Alas this doesn't work if you have spring-cloud-sleuth enabled.

When the following in executing in FeignCleitnFactoryBean

        Client client = getOptional(context, Client.class);
        if (client != null) {
            if (client instanceof LoadBalancerFeignClient) {
                // not load balancing because we have a url,
                // but ribbon is on the classpath, so unwrap
                client = ((LoadBalancerFeignClient) client).getDelegate();
            }
            if (client instanceof FeignBlockingLoadBalancerClient) {
                // not load balancing because we have a url,
                // but Spring Cloud LoadBalancer is on the classpath, so unwrap
                client = ((FeignBlockingLoadBalancerClient) client).getDelegate();
            }
            builder.client(client);
        }

client is a LacyTracingFeignClient