method GET must not have a request body
描述
使用feign声明式调用接口，代码如下
/**
* 通过多条件查询用户
*
* @param params 参数
* @return response
*/
@GetMapping("/users")
Response<PageResponse<LinkedHashMap<String, Object>>> list( Map<String, String> params);
原因
- feign在调用请求的时候，如果参数上没有指明参数是请求体参数还是请求行参数，默认认为是请求体
- 项目中feign底层又使用的是okHttp，okHttp默认get方式请求不能有requestBody。源码如下
public Request.Builder method(String method, @Nullable RequestBody body) {
if (method == null) {
throw new NullPointerException("method == null");
} else if (method.length() == 0) {
throw new IllegalArgumentException("method.length() == 0");
} else if (body != null && !HttpMethod.permitsRequestBody(method)) {
throw new IllegalArgumentException("method " + method + " must not have a request body.");
} else if (body == null && HttpMethod.requiresRequestBody(method)) {
throw new IllegalArgumentException("method " + method + " must have a request body.");
} else {
this.method = method;
this.body = body;
return this;
}
}
解决办法
参数上添加RequestParam注解
/**
* 通过多条件查询用户
*
* @param params 参数
* @return response
*/
@GetMapping("/users")
Response<PageResponse<LinkedHashMap<String, Object>>> list(@RequestParam Map<String, String> params);