@SuppressWarnings("unchecked")
    @Override
    public MethodDescriptor<R, P> getMethodDescriptor() {
        return (MethodDescriptor<R, P>) delegate().getMethodDescriptor();
    }
Handle response of json generic service.

@param <R> request message
@param <P> response message
shenyu-client/shenyu-client-grpc/src/main/java/org/apache/shenyu/client/grpc/json/JsonForwardingServerCall.java