REQUEST_URI doesn't contain http string for ssl validation

[LogixTree]

Hi guys,
I just came around very strange issue. I have been looking at the following code.

<?php
if ( force_ssl_admin() && ! is_ssl() ) {
        if ( 0 === strpos( $_SERVER['REQUEST_URI'], 'http' ) ) {
                wp_safe_redirect( set_url_scheme( $_SERVER['REQUEST_URI'], 'https' ) );
                exit();
        } else {
                wp_safe_redirect( 'https://' . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'] );
                exit();
        }
}

Clearly, We are looking for http string to find out if it's ssl or not.
But under the PHP config. We don't have any http or https string.

Whenever we try to login. It just hang on redirects and end up many redirect.
I tried bypass by adding filter

<?php
add_filter('secure_auth_redirect', '__return_false');

But seems like same coding is under wp-login.php.

[LogixTree]

Replying to LogixTree:
Cloudflare was coming in between with it's flexible ssl. Apologies for confusion.