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！

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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
<?php

namespace 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

<?php

namespace 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 () {
    //
});

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