Spring Cloud Openfeign More friendly hints in dynamic URL

Is your feature request related to a problem? Please describe.

spring-cloud-openfeign-core:2.2.5.RELEASE

When I use a dynamic URL, like this:

    @FeignClient(name = "dynamic")
    interface DynamicClient {

        @RequestLine("GET /")
        String get(URI uri);
    }

I will get an exception message:

Caused by: com.netflix.client.ClientException: Load balancer does not have available server for client: github.com
    at com.netflix.loadbalancer.LoadBalancerContext.getServerFromLoadBalancer(LoadBalancerContext.java:483)

Describe the solution you'd like More friendly tips.

Describe alternatives you've considered

Internally provide a constant for the empty URL:

    @FeignClient(name = "dynamic", url = FeignUtils.EMPTY_CLIENT, configuration = FooConfiguration.class)
    interface DynamicClient {

        @RequestLine("GET /")
        String get(URI uri);
    }

Also, add a comment for url()

    /**
     * @return an absolute URL or resolvable hostname (the protocol is optional).
     * If you are using {@link java.net.URI}, configure the value to {@link FeignUtils#EMPTY_CLIENT}
     */
    String url() default "";

Comment From: OlgaMaciaszek

Hello @crossoverJie; the 2.2.x branch is no longer supported. The test you've provided does not reproduce a valid use-case. Please verify if there's an issue on one of the supported versions (branch 3.1.x or main). If yes, please provide a minimal, complete, verifiable example that reproduces the issue.

Comment From: spring-cloud-issues

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