Using ngrok with Craft CMS 3

cmd.sh

ngrok http -region=eu -host-header=my-dev-domain.local 443

general.php

<?php

$isNgrok = array_key_exists('HTTP_X_ORIGINAL_HOST', $_SERVER) && strpos($_SERVER['HTTP_X_ORIGINAL_HOST'], 'ngrok');
$host    = $isNgrok ? ('https://' . $_SERVER['HTTP_X_ORIGINAL_HOST'] . '/') : getenv('DEFAULT_SITE_URL');

return [
	'*' => [
		// ...
		
		'siteUrl' => $host,
		'baseCpUrl' => $host,
	    'aliases' => [
	    	'web' => $host,
	    ],
	],
	
	// ...
];