redirect problem when file_get_html on php

I want to see html source of ‘https://piugame.com’ on php. but I got error code like this.

Warning: file_get_contents(https://piugame.com): Failed to open stream: Redirection limit reached, aborting in /simple_html_dom.php on line 82

So, I access ‘https://piugame.com’ on iframe tag. turn on the DevTools and saw this redirect loop.

enter image description here

What is this? and How can I stop this loop?

this is php code about to get html source

<?php
    include 'simple_html_dom.php';

    $html = file_get_html('https://piugame.com');
    echo $html;
?>

and this is html code about to see redirect loop

<HTML>
<iframe src="https://piugame.com"></iframe>
</HTML>