How to Enable CORS in Laravel 5.1?

How to Enable CORS in Laravel 5.1

Integrating CORS (Cross-Origin Resource Sharing) into Laravel allows servers to grant permission for cross-origin API calls. This article guides you through specific ways to enable CORS in Laravel version 5.1.

CORS Middleware for Laravel

// app/Http/Middleware/CORS.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;
    }

}

Register the CORS Middleware

After creating the middleware, register it in the app/Http/Kernel.php file:

// app/Http/Kernel.php

protected $routeMiddleware = [
        //other middlewares
        'cors' => 'App\Http\Middleware\CORS',
    ];

Apply CORS in Routes

Finally, use the cors middleware in the routes where you want to allow cross-origin API calls:

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

Note for Laravel ^8.0

In Laravel versions 8.0 and above, it's important to use the following syntax to register the CORS middleware due to namespace changes:

// app/Http/Kernel.php

protected $routeMiddleware = [
        //other middlewares
        'cors' => 'App\Http\Middleware\CORS',
    ];

// routes/web.php or routes/api.php

use App\Http\Controllers\ExampleController;

Route::get('example', [ExampleController::class, 'dummy'])->middleware('cors');

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