Description:
------------
Http autentication doesnt works on Safari / MacOS.

No authentication dialog is opened. (using code from 
documentation)

Reproduce code:
---------------
<?php
? if (!isset($_SERVER['PHP_AUTH_USER'])) {
?? header('WWW-Authenticate: Basic realm="My Realm"');
?? header('HTTP/1.0 401 Unauthorized');
?? echo 'Text to send if user hits Cancel button';
?? exit;
? } else {
?? echo "<p>Hello {$_SERVER['PHP_AUTH_USER']}.</p>";
?? echo "<p>You entered {$_SERVER['PHP_AUTH_PW']} as your password.</p>";
? }
?>

Expected result:
----------------
authentication dialog,

<p>Hello user123</p><p>Yoe entered test as your 
password.</p>

Actual result:
--------------
no authentication dialog.

Text to send if user hits Cancel button