关于路由，中间件，Cors，JSONP，这样有什么错误吗？

我在使用vue.js的jsonp获取参数时，浏览器显示200，也获取到了数据，但是不执行success方法。百度上说是跨域请求的问题。我使用了路由+中间价来使用Cors放开跨域。但是报错500，我不知道是中间件还是路由的问题，请大家帮你我看看。
中间件：
<?php

namespace App\Http\Middleware;

use Closure;

class CorsMiddleware
{
/**

• Handle an incoming request.
• @param \Illuminate\Http\Request $request
• @param \Closure $next
• @return mixed
  */
  public function handle($request, Closure $next)
  {
  $response = $next($request);
  $response->header('Access-Control-Allow-Origin', 'GET,POST');
  $response->header('Access-Control-Allow-Headers', 'Origin, Content-Type, Cookie, Accept');
  $response->header('Access-Control-Allow-Methods', 'GET, POST, PATCH, PUT, OPTIONS');
  $response->header('Access-Control-Allow-Credentials', 'true');
  return $next($request);
  }
  }
  中间件注册：Kernel.php
  protected $routeMiddleware = [
  'auth' => \App\Http\Middleware\Authenticate::class,
  'auth.basic' => \Illuminate\Auth\Middleware\AuthenticateWithBasicAuth::class,
  'can' => \Illuminate\Foundation\Http\Middleware\Authorize::class,
  'guest' => \App\Http\Middleware\RedirectIfAuthenticated::class,
  'throttle' => \Illuminate\Routing\Middleware\ThrottleRequests::class,
  'callback'=> \App\Http\Middleware\CorsMiddleware::class,
  ];
  }
  路由：Route::get('/front/index/indexLevelOne/{id}',['middleware' => 'auth', function () {
  'Front\IndexController@newGoods'
  }]);