HTTP Middleware:-

• Laravel includes a middleware that verifies the user of an application whether the user is authenticated or not.
• If the user is not authenticated, then the middleware will redirect the user to the login screen.
• If it doesn't happen, i.e, if the user is authenticated, the middleware will allow the request to proceed further into the application.
• There are several middleware included in the Laravel framework, which includes middleware for maintenance, authentication, CSRF protection, and more.
• All of these middleware are located in the app/Http/Middleware directory.
• To create a new middleware, use the make:middleware Artisan command:-

                       php artisan make:middleware Middleware1

• The above command will place a new Middleware1 class within our app/Http/Middleware directory.
• Discussing it with a suitable example:-

                      <?php

                   namespace App\Http\Middleware;

                   use Closure;

                   class Middleware1

                     {

                       public function request($request, Closure $next)

                            {

                               if ($request‐>input('roll') <= 50) {

                               return redirect('home');

                             }

                                 return $next($request);

                            }

                       }

• In the above example, we will only allow access to the route if the supplied roll is greater than 50.
• Otherwise, we will redirect the users back to the "home" URL.
• If we want a middleware to be run during every HTTP request to our application, we need to list the middleware class in the $middleware property of our app/Http/Kernel.php class.
• If we would like to assign middleware to specific routes, we should first assign the middleware a shorthand key in our app/Http/Kernel.php file.
• By default, the $routeMiddleware property contains entries for the middleware included with Laravel.
• Once the middleware has been defined in the HTTP kernel, we may use the middleware key in the route options array:-

                         Route::get('admin/profile', ['middleware' => 'auth', function () {

                             //

                          }]);