While trying to move the wp-content to new folder, there is constant called WP_CONTENT_URL.

Why do we need this one? Does WP_CONTENT_DIR and WP_CONTENT_URL needs to be same?

Bcoz there are several websites which can find my wordpress themes and plugins. how do they do that?

I am trying to move move my wp-content folder so added this code in wp-config.php just above require_once( ABSPATH . 'wp-settings.php' );

define('WP_CONTENT_DIR', dirname(__FILE__) . 'server/stuffs');
define('WP_CONTENT_URL', 'https://' . $_SERVER['HTTP_HOST'] . 'server/stuffs' );

But it causes Internal server error, when I trying to access my admin page

Thanks in Advance!!