$queue
$queue :
add(callable $middleware) : \think\http\middleware\DispatcherInterface
在队尾添加 middleware
| callable | $middleware |
insert(callable $middleware) : \think\http\middleware\DispatcherInterface
在队前插入 middleware
| callable | $middleware |
dispatch(\think\Request $request) : \think\Response
处理 request 并返回 response
| \think\Request | $request |