如何用原生feign简化http的调用

package com.example.demo.controller;

import com.example.demo.bean.User;
import org.springframework.web.bind.annotation.*;

@RestController
@RequestMapping("/user")
public class UserAction {

    @RequestMapping("/list")
    public Object list(){
        return "sdfsdfsdfsdf";
    }

    @RequestMapping("/add")
    public Object add(@RequestBody User user){
        return "sdfsdfsdfsdf";
    }
}

package com.example.demo.feign;

import com.example.demo.bean.User;
import feign.Body;
import feign.Headers;
import feign.Param;
import feign.RequestLine;

public interface Invorker {

    @RequestLine(value = "POST /user/add")
    @Headers("Content-Type: application/json")
    public Object add(User user);

    @RequestLine("GET /user/list")
    public Object list();
}