public <T> T target(
        Class<T> apiType, String url, FallbackFactory<? extends T> fallbackFactory) {
      return target(new Target.HardCodedTarget<T>(apiType, url), fallbackFactory);
    }
Same as {@link #target(Class, String, T)}, except you can inspect a source exception before
creating a fallback object.
hystrix/src/main/java/feign/hystrix/HystrixFeign.java