Merge pull request #4515 from dunglas/add-set-cache-headers-middleware

[5.6] Add the SetCacheHeaders middleware

app/Http/Kernel.php

@@ -54,6 +54,7 @@ class Kernel extends HttpKernel
         'auth' => \Illuminate\Auth\Middleware\Authenticate::class,
         'auth.basic' => \Illuminate\Auth\Middleware\AuthenticateWithBasicAuth::class,
         'bindings' => \Illuminate\Routing\Middleware\SubstituteBindings::class,
+        'cache.headers' => \Illuminate\Http\Middleware\SetCacheHeaders::class,
         'can' => \Illuminate\Auth\Middleware\Authorize::class,
         'guest' => \App\Http\Middleware\RedirectIfAuthenticated::class,
         'throttle' => \Illuminate\Routing\Middleware\ThrottleRequests::class,