<?php
namespace app\middleware;
use think\Response;
class ResourceMiddleware
{
    public function handle($request, \Closure $next)
    {
        $allowExt='/^(jpg|jpeg|png|gif|css|js|ico)$/';
        if(preg_match($allowExt,pathinfo($request->pathinfo(),PATHINFO_EXTENSION))){
            $filename = root_path() . $request->pathinfo();
            return new \think\swoole\response\File($filename);
            /** @var Response $response */
            $response = $next($request);
            return $response;
        }
        return $next($request);
    }
}