kqueue (BSD/macOS), or /dev/poll (Solaris). Tornado will also run on Windows, although this configuration is not officially supported or recommended for pro- duction use. Some features are missing on set() to make it exit). The Application object The Application object is responsible for global configuration, including the routing table that maps requests to handlers. The routing table is a list of URLSpec used to customize the behavior of the ap- plication and enable optional features; see Application.settings for the complete list. Subclassing RequestHandler Most of the work of a Tornado web application

kqueue (BSD/macOS), or /dev/poll (Solaris). Tornado will also run on Windows, although this configuration is not officially supported or recommended for production use. Some features are missing on Windows set() to make it exit).The Application object The Application object is responsible for global configuration, including the routing table that maps requests to handlers. The routing table is a list of URLSpec used to customize the behavior of the application and enable optional features; see Application.settings for the complete list. Subclassing RequestHandler Most of the work of a Tornado web application

let result = add(2, 2); assert_eq!(result, 4); } } 上述代码就是自动生成的测试模块。cfg 属性代表配置（configuration），它告诉 Rust 接下来 的项只有在给定特定配置选项时，才会被包含。在这种情况下，配置选项是 test，即 Rust 所 提供的用于编译和运行测试的配置选项。通过使用 cfg 属性，Cargo