Update main.py

main.py

@@ -152,7 +152,8 @@ def download_and_encode(url: str) -> str:
             data = resp.read()
         mime, _ = mimetypes.guess_type(safe_url)
         mime = mime or "image/png"
-        b64 = base64.b64encode(data).decode("ascii")
+        # b64 = base64.b64encode(data).decode("ascii")
+        b64 = base64.b64encode(data).decode()      # 新的，与 Gradio 版本一致
         return f"data:{mime};base64,{b64}"
     except Exception as e:
         print(f"[WARN] 下载外链图片失败 {url}: {e}")