WordPress Fix for soft SSL provided by Cloudflare

wp-fix-cloudflare-ssl.php

<?php
/**
 * Add following snippet in functions.php of your active theme. it should fix both admin and frontend.
 */

function ms_admin_head() {
	echo '<meta http-equiv="Content-Security-Policy" content="upgrade-insecure-requests">';
}
add_action( 'admin_print_styles', 'ms_admin_head', 1 );
add_action( 'wp_head', 'ms_admin_head', 1 );
add_action( 'login_enqueue_scripts', 'ms_admin_head', 1 );