Basic auth with web connector

Dear Sirs,

I create a verry small example to load tables from a php website with basic auth.

But the web connector does not authenticate with the php app.

This is the verry basic PHP code:

<?php
if (!isset($_SERVER['PHP_AUTH_USER'])) 
{
    header('WWW-Authenticate: Basic realm="My Realm"');
    header('HTTP/1.0 401 Unauthorized');
    echo 'Text to send if user hits Cancel button';
    exit;
} 
else 
{
?>
<table>
<thead>
<tr><td>Name</td><td>Password</td></tr>
</thead>
<tbody>
<tr><td><?=$_SERVER['PHP_AUTH_USER']?></td><td><?=$_SERVER['PHP_AUTH_PW']?></td></tr>
</tbody>
</table>
<?php
}
?>

Now when I do the following the screen always comes back. I can't authenticate.

How to do this basic authentication correctly?

Kind regards