add err

goutubedl.go

@@ -493,7 +493,10 @@ func infoFromURL(
 		for _, caption := range info.AutomaticCaptions[lang] {
 			resp, respErr := get(caption.URL)
 			if respErr == nil {
-				buf, _ := io.ReadAll(resp.Body)
+				buf, err := io.ReadAll(resp.Body)
+				if err != nil {
+					options.DebugLog.Print("err", "download "+caption.URL, err)
+				}
 				resp.Body.Close()
 				caption.Bytes = buf
 			}