业务代码中调用简单的查询接口：
Controller层：

@Controller
@RequestMapping("/agentReturnDetail")
public class AgentReturnDetailController  extends BasicController {
    @Autowired
    AgentReturnDetailService agentReturnDetailService;

    @RequestMapping(value = "/list",method = RequestMethod.GET)
    @ApiOperation(value = "供应商退货详情")
    @FastMappingInfo(needLogin = true)
    public ActionResult list(@RequestParam String returnId) throws Exception {
        if (null==returnId){
            return actionResult(ErrorCode.IllegalArument);
        }
        FunctionResult result=agentReturnDetailService.list(returnId);
        return actionResult(result.getCode(),result.getValue());
    }
}

Service层:

 public FunctionResult list(String returnId){
        FunctionResult result = new FunctionResult();
        List<AgentReturnDetailDO> doList = agentReturnDetailDOMapper.getListByReturnId(returnId);
        List<AgentReturnDetailShowVO> voList = new ArrayList<>();
        for (AgentReturnDetailDO entity : doList) {
            AgentReturnDetailShowVO model = new AgentReturnDetailShowVO();
            BeanUtils.copyProperties(entity, model);
            voList.add(model);
        }
        result.setCode(ErrorCode.Success);
        result.setValue(doList);
        return result;
    }

查询内容很简单，数据也能正常进断点，查询到数据，但是接口一直报404错误，如图：

简书16-1.png

请教同事，大佬一秒确认Response Body问题.
发现使用的注解是@Controller，需要再使用注解@ResponseBody，
或者直接使用@RestController注解，效果上等于这两者之和.

修改后问题解决。

简书16-2.png