Token Mismatch issue in IFrame in Internet Explorer. Laravel 5.2 - laravel-5.1

Question

What's the problem ?
I am facing Token Mismatch issue when accessing the site in IFrame in Internet Explorer.
What I tried so far ?
I search for the resolution and found this link
Below is the code that I found in the above link
App::after(function ($request,$response){
if($request->is('external/*')){
// IE iframe cookie fix
$response->header('P3P',
'CP="IDC DSP COR ADM DEVi TAIi PSA PSD IVAi IVDi CONi HIS OUR IND CNT"');
}
});
What's the question ?
Where should I write the above code in Laravel 5.2 ?

Answer 1

You should create after middleware and add this middleware to web middleware assuming you use web group middleware for your routes.
Sample middleware:
<?php
namespace App\Http\Middleware;
use Closure;
class FixIeFrameMiddleware
{
public function handle($request, Closure $next)
{
$response = $next($request);
if($request->is('external/*')){
// IE iframe cookie fix
$response->header('P3P',
'CP="IDC DSP COR ADM DEVi TAIi PSA PSD IVAi IVDi CONi HIS OUR IND CNT"');
}
return $response;
}
}
and now in app/Http/Kernel.php in $middlewareGroups property for web group you should add new array element:
\App\Http\Middleware\FixIeFrameMiddleware::class,