<FilesMatch "\.gpx$">
<IfModule mod_headers.c>
Header add Access-Control-Allow-Origin "https://www.freemap.sk"
Header merge Vary: Origin
</IfModule>
</FilesMatch>
<iframe
allow="fullscreen"
src="https://www.freemap.sk/?map=11/48.661263/18.619423&gpx-url=https%3A//example.com/filename.gpx"
style="width: 500px; height: 300px; border: 0"
title="Freemap with gpx"></iframe>