diff --git a/.vscode/launch.json.template b/.vscode/launch.json.template
index c3e2c50c52..2611b75c6c 100644
--- a/.vscode/launch.json.template
+++ b/.vscode/launch.json.template
@@ -2,21 +2,10 @@
     "version": "0.2.0",
     "configurations": [
         {
-            "name": "Python: Flask API",
+            "name": "Python: API (gevent)",
             "type": "debugpy",
             "request": "launch",
-            "module": "flask",
-            "env": {
-                "FLASK_APP": "app.py",
-                "FLASK_ENV": "development"
-            },
-            "args": [
-                "run",
-                "--host=0.0.0.0",
-                "--port=5001",
-                "--no-debugger",
-                "--no-reload"
-            ],
+            "program": "${workspaceFolder}/api/app.py",
             "jinja": true,
             "justMyCode": true,
             "cwd": "${workspaceFolder}/api",
diff --git a/api/.vscode/launch.json.example b/api/.vscode/launch.json.example
index 6bdfa2c039..1001559176 100644
--- a/api/.vscode/launch.json.example
+++ b/api/.vscode/launch.json.example
@@ -3,29 +3,21 @@
     "compounds": [
         {
             "name": "Launch Flask and Celery",
-            "configurations": ["Python: Flask", "Python: Celery"]
+            "configurations": ["Python: API (gevent)", "Python: Celery"]
         }
     ],
     "configurations": [
         {
-            "name": "Python: Flask",
-            "consoleName": "Flask",
+            "name": "Python: API (gevent)",
+            "consoleName": "API",
             "type": "debugpy",
             "request": "launch",
             "python": "${workspaceFolder}/.venv/bin/python",
             "cwd": "${workspaceFolder}",
             "envFile": ".env",
-            "module": "flask",
+            "program": "${workspaceFolder}/app.py",
             "justMyCode": true,
-            "jinja": true,
-            "env": {
-                "FLASK_APP": "app.py",
-                "GEVENT_SUPPORT": "True"
-            },
-            "args": [
-                "run",
-                "--port=5001"
-            ]
+            "jinja": true
         },
         {
             "name": "Python: Celery",
diff --git a/api/app.py b/api/app.py
index fb0669bc74..e53b037be5 100644
--- a/api/app.py
+++ b/api/app.py
@@ -1,5 +1,6 @@
 from __future__ import annotations
 
+import logging
 import sys
 from typing import TYPE_CHECKING, cast
 
@@ -9,12 +10,25 @@ if TYPE_CHECKING:
     celery: Celery
 
 
+HOST = "0.0.0.0"
+PORT = 5001
+logger = logging.getLogger(__name__)
+
+
 def is_db_command() -> bool:
     if len(sys.argv) > 1 and sys.argv[0].endswith("flask") and sys.argv[1] == "db":
         return True
     return False
 
 
+def log_startup_banner(host: str, port: int) -> None:
+    debugger_attached = sys.gettrace() is not None
+    logger.info("Serving Dify API via gevent WebSocket server")
+    logger.info("Bound to http://%s:%s", host, port)
+    logger.info("Debugger attached: %s", "on" if debugger_attached else "off")
+    logger.info("Press CTRL+C to quit")
+
+
 # create app
 flask_app = None
 socketio_app = None
@@ -43,5 +57,6 @@ if __name__ == "__main__":
     from gevent import pywsgi
     from geventwebsocket.handler import WebSocketHandler  # type: ignore[reportMissingTypeStubs]
 
-    server = pywsgi.WSGIServer(("0.0.0.0", 5001), socketio_app, handler_class=WebSocketHandler)
+    log_startup_banner(HOST, PORT)
+    server = pywsgi.WSGIServer((HOST, PORT), socketio_app, handler_class=WebSocketHandler)
     server.serve_forever()