Any way to get the URL with this code?

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I'm trying to get the live stream (.mpd) URL using "File_Get_Contents" with JS but I get a "304 Not Modified" status code.
Is there any way to get it or it's not possible? I can do it with PHP but then the url only works locally.

<script>
function file_get_contents(filename) {
    fetch(filename).then((resp) => resp.text()).then(function(data) {
        url = JSON.parse(data);
        location.replace(url['delivery']['url']);
    });
}
file_get_contents('https://mediainfo.tf1.fr/mediainfocombo/L_LCI');
</script>

Thank you in advance.