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JavaScript: Fetch text from php and alert

quite a noob question, but I tried to use php for the first time and can't get it to work...

I have the most basic php file

<?php
echo 'Hello World!';
?>

and I try to fetch the output and alert that. Just for learning how to do that...

My JS code (more or less like here):

fetch('./test.php').then(function(response) {
    return response.text().then(function(text) {
        alert(text);
    });
});

Both file (test.php and the js file are in the same folder).

Could someone tell me what is wrong here?

Thanks, celdri

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