Site in Web Forms - how to allow access only to this application?

Question

Access rights

Hello, we have created an application in WebForms that opens the site.
What should be written in the site in index.php to check that access comes from the application, so that when you enter the site from a regular browser, there is an empty page, and from the application, the site is displayed.

how to write in index.php simple if

$token = "dfakli32aedaf"

if (webforms == token) { site access} else { echo 'access denied!'}

tell me a simple real example of what webforms should send or how, and what to check in index.php on the site.

Answer 1

You can change the UserAgent to, for example, webforms , and check it in PHP:

<?php

if ($_SERVER['HTTP_USER_AGENT'] !== 'webforms') {
    die();
}