Laravel API跨域访问的实现步骤

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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。

1	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

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

第一步: 创建中间件

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创建 `app/Http/Middleware/AccessControlAllowOrigin.php` middleware 把 'Access-Control-Allow-Origin: *' 写入头部. app/Http/Middleware/AccessControlAllowOrigin.php <?php   namespace AppHttpMiddleware;   use Closure; use IlluminateSupportFacadesAuth;   class AccessControlAllowOrigin {     /**      *      * Handle an incoming request.      *      * @param  IlluminateHttpRequest  $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.

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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

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<?php   namespace AppHttp;   use IlluminateFoundationHttpKernel 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 = [         IlluminateFoundationHttpMiddlewareCheckForMaintenanceMode::class,         IlluminateFoundationHttpMiddlewareValidatePostSize::class,         AppHttpMiddlewareTrimStrings::class,         IlluminateFoundationHttpMiddlewareConvertEmptyStringsToNull::class,         AppHttpMiddlewareAccessControlAllowOrigin::class,     ];       /**      * The application's route middleware groups.      *      * @var array      */     protected $middlewareGroups = [         'web' => [             AppHttpMiddlewareEncryptCookies::class,             IlluminateCookieMiddlewareAddQueuedCookiesToResponse::class,             IlluminateSessionMiddlewareStartSession::class,             // IlluminateSessionMiddlewareAuthenticateSession::class,             IlluminateViewMiddlewareShareErrorsFromSession::class,             AppHttpMiddlewareVerifyCsrfToken::class,             IlluminateRoutingMiddlewareSubstituteBindings::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' => IlluminateAuthMiddlewareAuthenticate::class,         'auth.basic' => IlluminateAuthMiddlewareAuthenticateWithBasicAuth::class,         'bindings' => IlluminateRoutingMiddlewareSubstituteBindings::class,         'can' => IlluminateAuthMiddlewareAuthorize::class,         'guest' => AppHttpMiddlewareRedirectIfAuthenticated::class,         'throttle' => IlluminateRoutingMiddlewareThrottleRequests::class,         'cors' => AppHttpMiddlewareAccessControlAllowOrigin::class,     ]; }

第四步：在路由中添加路由

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

以上就是Laravel API跨域访问的实现步骤的详细内容。