diff --git a/cmd/proxy/main.go b/cmd/proxy/main.go
index 5c207da..e21783d 100644
--- a/cmd/proxy/main.go
+++ b/cmd/proxy/main.go
@@ -398,6 +398,16 @@ func (server *Server) streamOnline(w http.ResponseWriter, r *http.Request, mtime
 
 		memoryObject.wg.Wait()
 
+		if response.ContentLength > 0 {
+			if memoryObject.Offset == int(response.ContentLength) && err != nil {
+				slog.With("length", memoryObject.Offset, "error", err, "upstreamIdx", selectedIdx).Debug("something happened during download. but response body is read as whole. so error is reset to nil")
+				err = nil
+			}
+		} else if err == io.EOF {
+			slog.With("length", memoryObject.Offset, "error", err, "upstreamIdx", selectedIdx).Debug("something happened during download. content length is not specified and error is a eof. so error is reset to nil")
+			err = nil
+		}
+
 		if err != nil {
 			slog.With("error", err, "upstreamIdx", selectedIdx).Error("something happened during download. will not cache this response")
 		}