@Override
    public <T> T target(final Class<T> apiType, final String url) {
      checkNotNull(apiType, "Argument apiType must be not null");
      checkNotNull(url, "Argument url must be not null");

      return target(new Target.HardCodedTarget<>(apiType, url));
    }
Defines target and builds client.

@param apiType API interface
@param url base URL
@param <T> class of API interface
@return built client
vertx/feign-vertx/src/main/java/feign/VertxFeign.java