update parse content type

httpclient/implement/response.go

@@ -69,10 +69,9 @@ func (r *Response) fillResponseBody(reqCfg *define.Request, response *define.Res
 	if responseContentType == "" {
 		// 返回数据未说明 Content-Type
 		if response.RestyResponse.StatusCode() != http.StatusOK {
-			responseContentType = "application/json"
-		} else {
-			return errors.New("response content type is empty")
+			return nil
 		}
+		return errors.New("response content type is empty")
 	}
 	typeArr := strings.Split(strings.Split(responseContentType, ";")[0], "/")
 	responseType := "json"