下面由Laravel框架教程栏目给大家介绍Laravel API允许跨域访问，希望对需要的朋友有所帮助！

服务器A请求服务器B的接口，那么一般会出现跨域问题。全解跨域请求处理办法

XMLHttpRequest cannot load http://api.console.vms3.com/api/user. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:8080' istherefore not allowed access.

意思就是服务器响应不允许跨域访问.

那我们就需要让服务器支持跨域访问, 也就是在响应头部中添加

"'Access-Control-Allow-Origin: *'"

第一步: 创建中间件

创建 `app/Http/Middleware/AccessControlAllowOrigin.php` middleware 把 'Access-Control-Allow-Origin: *' 写入头部.app/Http/Middleware/AccessControlAllowOrigin.php<?phpnamespace App\Http\Middleware;use Closure;use Illuminate\Support\Facades\Auth;class AccessControlAllowOrigin{    /**     *     * Handle an incoming request.     *     * @param  \Illuminate\Http\Request  $request     * @param  \Closure  $next     * @return mixed     */    public function handle($request, Closure $next)    {        header('Access-Control-Allow-Origin: *');        header("Access-Control-Allow-Credentials: true");        header("Access-Control-Allow-Methods: *");        header("Access-Control-Allow-Headers: Content-Type,Access-Token");        header("Access-Control-Expose-Headers: *");        return $next($request);    }}

第二步: 注册路由

注册这个 middleware 到 kernel 中.
分别在 protected $middleware 数组中和 protected $routeMiddleware 数组中
添加我们刚才创建的那个文件class名, 使用 cors 这个别名.

第三步: 设置中间件保护接口

然后在设置它保护 api , 就是$middlewareGroups['api'] 的数组中添加它的别名, 本文中是 'cors'
app/Http/Kernel.php

<?phpnamespace App\Http;use Illuminate\Foundation\Http\Kernel as HttpKernel;class Kernel extends HttpKernel{    /**     * The application's global HTTP middleware stack.     *     * These middleware are run during every request to your application.     *     * @var array     */    protected $middleware = [        \Illuminate\Foundation\Http\Middleware\CheckForMaintenanceMode::class,        \Illuminate\Foundation\Http\Middleware\ValidatePostSize::class,        \App\Http\Middleware\TrimStrings::class,        \Illuminate\Foundation\Http\Middleware\ConvertEmptyStringsToNull::class,        \App\Http\Middleware\AccessControlAllowOrigin::class,    ];    /**     * The application's route middleware groups.     *     * @var array     */    protected $middlewareGroups = [        'web' => [            \App\Http\Middleware\EncryptCookies::class,            \Illuminate\Cookie\Middleware\AddQueuedCookiesToResponse::class,            \Illuminate\Session\Middleware\StartSession::class,            // \Illuminate\Session\Middleware\AuthenticateSession::class,            \Illuminate\View\Middleware\ShareErrorsFromSession::class,            \App\Http\Middleware\VerifyCsrfToken::class,            \Illuminate\Routing\Middleware\SubstituteBindings::class,        ],        'api' => [            'throttle:60,1',            'bindings',            'cors'        ],    ];    /**     * The application's route middleware.     *     * These middleware may be assigned to groups or used inpidually.     *     * @var array     */    protected $routeMiddleware = [        'auth' => \Illuminate\Auth\Middleware\Authenticate::class,        'auth.basic' => \Illuminate\Auth\Middleware\AuthenticateWithBasicAuth::class,        'bindings' => \Illuminate\Routing\Middleware\SubstituteBindings::class,        'can' => \Illuminate\Auth\Middleware\Authorize::class,        'guest' => \App\Http\Middleware\RedirectIfAuthenticated::class,        'throttle' => \Illuminate\Routing\Middleware\ThrottleRequests::class,        'cors' => \App\Http\Middleware\AccessControlAllowOrigin::class,    ];}

第四步：在路由中添加路由

Route::middleware('cors')->group(function () {    //});