Set headers on a request from a feature Test

CodeIgniter also provides a Response class that is an object-oriented representation of the HTTP response.
This gives you an easy and powerful way to construct your response to the client:

PHP Code:

use CodeIgniter\HTTP\Response;

class
{
    $response = service('response');

    $response->setHeader('Content-type', 'text/html');

    // Sends the output to the browser
    // This is typically handled by the framework
    $response->send();
} 


CodeIgniter 4 User Guide - Working With HTTP Requests

What did you Try? What did you Get? What did you Expect?

Joined CodeIgniter Community 2009.  ( Skype: insitfx )