fix: err 如果是 newApiErr 则保留

relay/channel/api_request.go

@@ -264,9 +264,8 @@ func doRequest(c *gin.Context, req *http.Request, info *common.RelayInfo) (*http
 	}
 
 	resp, err := client.Do(req)
-
 	if err != nil {
-		return nil, err
+		return nil, types.NewError(err, types.ErrorCodeDoRequestFailed, types.ErrOptionWithHideErrMsg("upstream error: do request failed"))
 	}
 	if resp == nil {
 		return nil, errors.New("resp is nil")