change home_url and site_url but don’t redirect to home_url and site_url on load

You need to set the WP_SITEURL and WP_HOME in wp-config.php file.
Please add below code.

define('WP_SITEURL', 'http://' . $_SERVER['HTTP_HOST']);
define('WP_HOME', 'http://' . $_SERVER['HTTP_HOST']);

In your server SSL setup then used below code

define('WP_SITEURL', 'https://' . $_SERVER['HTTP_HOST']);
define('WP_HOME', 'https://' . $_SERVER['HTTP_HOST']);