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/src/main/java/org/apache/shenyu/examples/http/controller/RequestController.java