Improved http vs https detection

To fix issues with cloudflare dns routing.

functions/route.php

@@ -43,10 +43,16 @@ class Route {
      * @return string - The string representation of the server's transfer protocol
      */
     public static function getProtocol() {
-        if ( !empty( $_SERVER['HTTPS'] ) && $_SERVER['HTTPS'] !== 'off' ) {
+        if (!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off') {
             return 'https';
         }
-        if ( $_SERVER['SERVER_PORT'] == 443 ) {
+        if (!empty($_SERVER['HTTP_X_FORWARDED_PROTO']) && $_SERVER['HTTP_X_FORWARDED_PROTO'] === 'https') {
+            return 'https';
+        }
+        if (!empty($_SERVER['HTTP_X_FORWARDED_PORT']) && $_SERVER['HTTP_X_FORWARDED_PORT'] == 443) {
+            return 'https';
+        }
+        if (!empty($_SERVER['SERVER_PORT']) && $_SERVER['SERVER_PORT'] == 443) {
             return 'https';
         }
         return 'http';