下面由Laravel框架教程欄目給大家介紹Laravel API允許跨域訪問，希望對需要的朋友有所幫助！

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服務(wù)器A請求服務(wù)器B的接口，那么一般會出現(xiàn)跨域問題。全解跨域請求處理辦法

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.

意思就是服務(wù)器響應(yīng)不允許跨域訪問.

那我們就需要讓服務(wù)器支持跨域訪問, 也就是在響應(yīng)頭部中添加

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

第一步: 創(chuàng)建中間件

創(chuàng)建 `app/Http/Middleware/AccessControlAllowOrigin.php` middleware 把 'Access-Control-Allow-Origin: *' 寫入頭部.
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: 注冊路由

注冊這個 middleware到 kernel中.
分別在 protected $middleware 數(shù)組中和protected $routeMiddleware 數(shù)組中
添加我們剛才創(chuàng)建的那個文件class名, 使用 cors這個別名.

第三步: 設(shè)置中間件保護(hù)接口

然后在設(shè)置它保護(hù) api , 就是$middlewareGroups['api']的數(shù)組中添加它的別名, 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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