How to Enable CORS in Laravel 5.1 Using Middleware?

Enabling CORS in Laravel 5.1

To enable Cross-Origin Resource Sharing (CORS) in Laravel 5.1, you can utilize middleware. Here's a comprehensive guide to implementing CORS using a custom middleware:

1. Create a CORS Middleware:

Create a file CORS.php in the app/Http/Middleware directory. Add the following code to this file:

<?php namespace App\Http\Middleware;

use Closure;

class CORS
{
    /**
     * 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: *");

        // ALLOW OPTIONS METHOD
        $headers = [
            'Access-Control-Allow-Methods' => 'POST, GET, OPTIONS, PUT, DELETE',
            'Access-Control-Allow-Headers' => 'Content-Type, X-Auth-Token, Origin'
        ];
        if ($request->getMethod() == "OPTIONS") {
            // The client-side application can set only headers allowed in Access-Control-Allow-Headers
            return Response::make('OK', 200, $headers);
        }

        $response = $next($request);
        foreach ($headers as $key => $value)
            $response->header($key, $value);
        return $response;
    }
}

2. Register the Middleware:

In your app/Http/Kernel.php file, add the following code to the $routeMiddleware array:

'cors' => \App\Http\Middleware\CORS::class,

3. Use the Middleware:

Now you can use the cors middleware in your routes. For example:

Route::get('example', ['middleware' => 'cors', 'uses' => 'ExampleController@dummy']);

By adding these changes, you'll enable CORS for the specified routes and allow cross-origin requests from any domain.

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