import socket

def test_port_binding(host, port):
    try:
        with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
            s.bind((host, port))
            print(f"成功绑定到 {host}:{port}")
    except PermissionError:
        print(f"绑定到 {host}:{port} 时权限不足")
    except Exception as e:
        print(f"绑定到 {host}:{port} 时发生错误: {e}")

# 测试绑定
test_port_binding("127.0.0.1", 3000)
test_port_binding("0.0.0.0", 3000)


from flask import Flask

app = Flask(__name__)
if __name__ == '__main__':
    app.run(host="127.0.0.1", port=3000)  # HTTPS required for secure cookies