I’m having some doubts about your code. IF your using WordPress you should use https://codex.wordpress.org/Plugin_API/Action_Reference/wp_ajax_(action)
So you no session.php, but a function:
add_action( 'wp_ajax_foobar', 'my_ajax_foobar_handler' );
function my_ajax_foobar_handler() {
$u = $_POST["url"];
$p = $_POST["product"];
echo $u . " " .$p ;
wp_die();
}
and simplify yours JS
jQuery.post(
my_foobar_client.ajaxurl,
{
'action': 'foobar',
'url' : 'www.google.com',
'product' : 'Map'
},
function(response) {
console.log(response);
}
);
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