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php artisan make:middleware SetCustomHeader

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namespace App\Http\Middleware;

use Closure;

class SetCustomHeader
{
    public function handle($request, Closure $next)
    {
        $request->headers->set('Custom-Header', 'Custom Value');

        return $next($request);
    }
}

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protected $middlewareGroups = [
    'web' => [
        // other middleware
        \App\Http\Middleware\SetCustomHeader::class,
    ],

    // other middleware groups
];

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protected $middleware = [
    // other middleware
    \App\Http\Middleware\SetCustomHeader::class,
];

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namespace App\Http\Middleware;

use Closure;

class SetCustomHeader
{
    public function handle($request, Closure $next)
    {
        $request->headers->set('Custom-Header', 'Custom Value');

        return $next($request);
    }
}

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