$actionMiddleware
$actionMiddleware : string
动作中间件
process(\Psr\Http\Message\ServerRequestInterface $request, \Psr\Http\Server\RequestHandlerInterface $handler) : \Psr\Http\Message\ResponseInterface
处理方法
| \Psr\Http\Message\ServerRequestInterface | $request | |
| \Psr\Http\Server\RequestHandlerInterface | $handler |