webman-exercise/app/middleware/Cors.php

<?php
namespace app\middleware;

use Webman\MiddlewareInterface;
use Webman\Http\Response;
use Webman\Http\Request;

class Cors implements MiddlewareInterface
{
    public function process(Request $request, callable $next) : Response
    {
        $response = $request->method() == 'OPTIONS' ? response('') : $next($request);
        $response->withHeaders([
            'Access-Control-Allow-Credentials' => 'true',
            'Access-Control->Allow-Origin' => $request->header('Origin', '*'),
            'Access-Control->Allow-Method' => '*',
            'Access-Control->Allow-Headers'=> '*',
        ]);
        return $response;
    }
    
}