首先看feign client代码:

  

@FeignClient(name = "SPRING-CLOUD-WEB-PROVIDER-GROUP2", url = "http://localhost:8761/")
public interface SongFeignClientWithUrl {
/*@GetMapping("/call/{id}")
public Object getSongInfo(@PathVariable("id") int id);*/ @RequestMapping(value = "/eureka/apps/{serviceName}", method = RequestMethod.GET)
public Object findServiceInfoFromEurekaByServiceName(@RequestParam(value = "serviceName") String serviceName);
}

上面实际是从eureka中查询service的节点服务信息

如下是controller代码:

  

@GetMapping("/{serviceName}")
public Object findServiceInfoFromEurekaByServiceName(/*@PathVariable("serviceName")*/ String serviceName) { return songFeignClientWithUrl.findServiceInfoFromEurekaByServiceName(serviceName); }

问题就出在Controller入参String serviceName,注解被注释或者没有加@PathVariable注解,导致入参取不到值,feign client拿到的也是null,报的这个错。。。

当然,如果返回数据太大也会报400

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