diff --git a/screenshots_flask.py b/screenshots_flask.py
index 4406630..88adc77 100644
--- a/screenshots_flask.py
+++ b/screenshots_flask.py
@@ -10,19 +10,26 @@ SCREENSHOTS_DIR = PROJECT_ROOT / "screenshots"
 
 @app.route('/image/<path:filename>')
 def serve_image(filename):
-    file_path = SCREENSHOTS_DIR / filename
+    app = Flask(__name__)
 
-    # 防止路径越界访问
-    try:
-        file_path.resolve().relative_to(SCREENSHOTS_DIR.resolve())
-    except ValueError:
-        abort(403, "禁止访问目录外文件")
+    PROJECT_ROOT = Path(__file__).parent.resolve()
+    SCREENSHOTS_DIR = PROJECT_ROOT / "screenshots"
 
-    if not file_path.exists():
-        abort(404, "文件不存在")
+    @app.route('/image/<path:filename>')
+    def serve_image(filename):
+        file_path = SCREENSHOTS_DIR / filename
 
-    return send_file(file_path, as_attachment=False)
+        # 防止路径越界访问
+        try:
+            file_path.resolve().relative_to(SCREENSHOTS_DIR.resolve())
+        except ValueError:
+            abort(403, description=f"禁止访问目录外文件: {file_path.resolve()}")
+
+        if not file_path.exists():
+            abort(404, description=f"文件不存在: {file_path.resolve()}")
+
+        return send_file(file_path, as_attachment=False)
 
 
 if __name__ == '__main__':
-    app.run(host='0.0.0.0', debug=False, port=5000)
+    app.run(host='0.0.0.0', debug=True, port=5000)