Where can I set headers in laravel

In Laravel 5, using Middleware, creating a new file, modifying an existing file:

New file: app/Http/Middleware/AddHeaders.php

<?php namespace App\Http\Middleware;

use Closure;
use Illuminate\Contracts\Routing\Middleware;

// If Laravel >= 5.2 then delete 'use' and 'implements' of deprecated Middleware interface.
class AddHeaders implements Middleware
{
    public function handle($request, Closure $next)
    {
        $response = $next($request);
        $response->header('header name', 'header value');
        $response->header('another header', 'another value');

        return $response;
    }
}

Modify existing file app/Kernel.php

protected $middleware = [
.
.
.

        'App\Http\Middleware\AddHeaders',
    ];

And you're set.

There are a couple of different ways you could do this - all have advantages/disadvantages.

Option 1 (simple): Since the array is just static data - just manually put the headers in your view layouts directly - i.e. dont pass it from anywhere - code it straight in your view.

<?php
  //set headers to NOT cache a page
  header("Cache-Control: no-cache, must-revalidate"); //HTTP 1.1
  header("Pragma: no-cache"); //HTTP 1.0
  header("Expires: Sat, 26 Jul 1997 05:00:00 GMT"); // Date in the past
?>

Option 2: Use view composers. You can use an App before filter to bind the header to all views in your app.

App::before(function($request)  
{
     $headers=array('Cache-Control'=>'no-cache, no-store, max-age=0, must-revalidate','Pragma'=>'no-cache','Expires'=>'Fri, 01 Jan 1990 00:00:00 GMT');

     View::share('headers', $headers);
}); 

Then just echo out the $headers in your view(s).

Note: you must let the view set your headers - that is why we are 'passing' the header into view for Laravel to handle. If you try and output the header itself from within a filter or something, you'll cause issues.

Edit Option 3: I just found out about this - you could try this

App::before(function($request)  
{
     Response::header('Cache-Control', 'nocache, no-store, max-age=0, must-revalidate');
     Response::header('Pragma', 'no-cache');
     Response::header('Expires', 'Fri, 01 Jan 1990 00:00:00 GMT');
});