private Mono<String> successMono(final Object body) {
        return Mono.just("response success: " + body);
    }
Test for cookie annotation.

@param userId            a cookie key with the name userId
@param serverHttpRequest request
@return response
shenyu-examples/shenyu-examples-http-swagger3/src/main/java/org/apache/shenyu/examples/http/controller/RequestController.java