Ensure flusher is not nil

pkg/inference/models/manager.go

@@ -314,6 +314,10 @@ func (m *Manager) PullModel(ctx context.Context, model string, w http.ResponseWr
 		flusher: flusher,
 	}
 
+	if flusher == nil {
+		m.log.Warnln("HTTP response writer does not support flushing, progress updates may be delayed")
+	}
+
 	// Pull the model using the Docker model distribution client
 	m.log.Infoln("Pulling model:", model)
 	err := m.distributionClient.PullModel(ctx, model, progressWriter)
@@ -337,6 +341,8 @@ func (w *progressResponseWriter) Write(p []byte) (n int, err error) {
 		return 0, err
 	}
 	// Flush the response to ensure the chunk is sent immediately
-	w.flusher.Flush()
+	if w.flusher != nil {
+		w.flusher.Flush()
+	}
 	return n, nil
 }