前后端项目跨域访问时会遇到此问题,解决方法如下:

创建一个中间件

php artisan make:middleware EnableCrossRequestMiddleware

该中间件的文件路径为:app/Http/Middleware/EnableCrossRequestMiddleware.php

中间件 EnableCrossRequestMiddleware 内容如下:

<?php
/**
* 跨域设置
*/ namespace App\Http\Middleware; use Closure;
use Illuminate\Http\Response; class EnableCrossRequestMiddleware
{
/**
* Handle an incoming request.
*
* @param \Illuminate\Http\Request $request
* @param \Closure $next
* @return mixed
*/
public function handle($request, Closure $next)
{
$response = $next($request); $origin = $request->server('HTTP_ORIGIN') ? $request->server('HTTP_ORIGIN') : '';
$allow_origin = config('origin.allowed'); if (in_array($origin, $allow_origin)) { $response->header('Access-Control-Allow-Origin', $origin);
$response->header('Access-Control-Allow-Headers', 'Origin, Content-Type, Cookie, X-CSRF-TOKEN, Accept, Authorization, X-XSRF-TOKEN');
$response->header('Access-Control-Expose-Headers', 'Authorization, authenticated');
$response->header('Access-Control-Allow-Methods', 'GET, POST, PATCH, PUT, OPTIONS');
$response->header('Access-Control-Allow-Credentials', 'true');
}
return $response;
}
}

app/Http/Kernal.php 文件中将其注册为全局中间件

namespace App\Http;

use App\Http\Middleware\AuthenticateMain;
use App\Http\Middleware\AuthenticateSeller;
use App\Http\Middleware\AuthenticateUser;
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 = [
\App\Http\Middleware\CheckForMaintenanceMode::class,
\Illuminate\Foundation\Http\Middleware\ValidatePostSize::class,
\App\Http\Middleware\TrimStrings::class,
\Illuminate\Foundation\Http\Middleware\ConvertEmptyStringsToNull::class,
\App\Http\Middleware\TrustProxies::class,
\App\Http\Middleware\EnableCrossRequestMiddleware::class, // 添加这一行将其注册为全局中间件
];
}

增加配置文件app/config/origin.php,内容为允许的域名

<?php
return [ 'allowed' => [
'http://test.example.com',
'http://test-fe.example.com:8080'
] ];

PS - 个人博客原文:Laravel 5.7 No 'Access-Control-Allow-Origin' header is present on the request resource

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