feat: add medias

backend/common/errorx/error.go

@@ -0,0 +1,19 @@
+package errorx
+
+import (
+	"fmt"
+)
+
+type Response struct {
+	Code    int    `json:"code"`
+	Message string `json:"message"`
+}
+
+func (r Response) Error() string {
+	return fmt.Sprintf("%d: %s", r.Code, r.Message)
+}
+
+var (
+	RequestParseError = Response{400, "请求解析错误"}
+	InternalError     = Response{500, "内部错误"}
+)