Detailed explanation of cross-domain solutions in laravel development

Preface

As we all know, when we use laravel for development, especially when the front-end and back-end are completely separated, since the front-end project runs on the designated port of our own machine ( It may also be someone else's machine), such as localhost:8000, and the laravel program runs on another port, so it is cross-domain. However, due to the browser's same-origin policy, cross-domain requests are illegal. In fact, this problem is easy to solve, just add a middleware. Not much to say below, let’s follow the editor to see the detailed solutions.

Solution:

1. Create a new middleware

php artisan make:middleware EnableCrossRequestMiddleware

2. Write the middleware content

<?php
namespace App\Http\Middleware;
use Closure;
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(&#39;HTTP_ORIGIN&#39;) ? $request->server(&#39;HTTP_ORIGIN&#39;) : &#39;&#39;;
 $allow_origin = [
  &#39;http://localhost:8000&#39;,
 ];
 if (in_array($origin, $allow_origin)) {
  $response->header(&#39;Access-Control-Allow-Origin&#39;, $origin);
  $response->header(&#39;Access-Control-Allow-Headers&#39;, &#39;Origin, Content-Type, Cookie, X-CSRF-TOKEN, Accept, Authorization, X-XSRF-TOKEN&#39;);
  $response->header(&#39;Access-Control-Expose-Headers&#39;, &#39;Authorization, authenticated&#39;);
  $response->header(&#39;Access-Control-Allow-Methods&#39;, &#39;GET, POST, PATCH, PUT, OPTIONS&#39;);
  $response->header(&#39;Access-Control-Allow-Credentials&#39;, &#39;true&#39;);
 }
 return $response;
 }
}

$allow_origin ArrayThe variable is your allowed cross-domain list and can be modified by yourself.

3. Then register the middleware in the kernel file

 protected $middleware = [
 // more
 App\Http\Middleware\EnableCrossRequestMiddleware::class,
 ];

Add it to the $middleware attribute of the App\Http\Kernel class. The middleware registered here belongs to the global middleware.
Then you will find that the front-end page can already send cross-domain requests.

It is normal that there will be one more request with method set to options, because the browser must first determine whether the server allows the cross-domain request.

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