[PHP知识库]Laravel自定义跨域中间件

在Middleware文件里新建文件 cors.php

<?php
namespace App\Http\Middleware;
use Closure;

class cors
{
    public function handle($request, Closure $next)
    {
        return $next($request)
            ->header('Access-Control-Allow-Origin', '*')
            ->header('Access-Control-Allow-Methods', '*')
            ->header('Access-Control-Allow-Headers', '*')
            ->header('Access-Control-Request-Headers', '*');
    }
}

打开Http/Kernel.php文件
在protected $middleware方法中加入下面一行代码

'App\Http\Middleware\cors',

加入完了之后应该是下面的样子。

```php
<?php namespace App\Http;

use Illuminate\Foundation\Http\Kernel as HttpKernel;

class Kernel extends HttpKernel {

	/**
	 * The application's global HTTP middleware stack.
	 *
	 * @var array
	 */
	protected $middleware = [
		'Illuminate\Foundation\Http\Middleware\CheckForMaintenanceMode',
		'Illuminate\Cookie\Middleware\EncryptCookies',
		'Illuminate\Cookie\Middleware\AddQueuedCookiesToResponse',
		'Illuminate\Session\Middleware\StartSession',
		'Illuminate\View\Middleware\ShareErrorsFromSession',
		'App\Http\Middleware\VerifyCsrfToken',
        'App\Http\Middleware\cors', //加上这一行代码， 表示把cors中间件应用于所有的http请求。
	];

	/**
	 * The application's route middleware.
	 *
	 * @var array
	 */
	protected $routeMiddleware = [
		'auth' => 'App\Http\Middleware\Authenticate',
		'auth.basic' => 'Illuminate\Auth\Middleware\AuthenticateWithBasicAuth',
		'guest' => 'App\Http\Middleware\RedirectIfAuthenticated',
	];
}

然后再用ajax请求路由的时候就不会有跨域报错了。