Update app.py

app.py

@@ -57,7 +57,7 @@ def translate_to_chinese(text):
 def generate_caption(image):
     try:
         # 如果输入是 URL，下载图片
-        if isinstance(image, str):
+        if isinstance(image, str) and (image.startswith("http://") or image.startswith("https://")):
             print("Downloading image from URL...")
             try:
                 response = requests.get(image, stream=True, timeout=10)