這篇文章給大家分享的是有關(guān)Laravel API允許跨域訪問的示例分析的內(nèi)容。小編覺得挺實(shí)用的，因此分享給大家做個(gè)參考，一起跟隨小編過來看看吧。

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服務(wù)器A請(qǐng)求服務(wù)器B的接口，那么一般會(huì)出現(xiàn)跨域問題。全解跨域請(qǐng)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(cè)路由

注冊(cè)這個(gè) 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(gè)文件class名, 使用 cors 這個(gè)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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