PHP, 54 bytes

<?=file_get_contents('http://a.pi/'.urlencode($argn));

Try it online!

Note: TIO does not allow external requests, though it probably doesn't really matter since a.pi does not really exist.

PHP, 54 47 bytes

<?=join(file('http://a.pi/'.urlencode($argn)));

Try it online!

Note: TIO does not allow external requests, though it probably doesn't really matter since a.pi does not really exist.

-7 bytes thx to @Kaddath!