Jquery ajax can not get POST value in same IP ADDRESS

JavaScript
1

I test the same script, run well in windows, but failed in CentOS.

1.php

<?php
header("Access-Control-Allow-Origin: http://MY-SERVER-PROVIDE-IP");
echo $_POST['name'];
?>

2.php

<script type='text/javascript' src='https://ajax.googleapis.com/ajax/libs/jquery/1.6.4/jquery.min.js?ver=1.6.4'></script>
<script type="text/javascript">
jQuery(document).ready(function(){
$.ajax({
     url: "http://MY-SERVER-PROVIDE-IP/1.php",
     dataType: "html",
     type: 'POST',
     data: "name=123456|abcdef",
     success: function(data){
        $("#result").html(data);
     }
});
});
</script>
<div id="result"></div>

The code is very basic, I check it in chrome network Hearders. all the thing are same, but the Response Header is different.

windows return Connection:Keep-Alive

CentOS return Connection:close

Where is the possible wrong?

BYW: Windows is on localhost, CentOS is new install, with php5.3 witch is place on a server(During the test, I have never use domain name, but a IP address).

And if change POST to GET, I can get value. I am not run as a Cross Domain post, why can not get the POST value?

Thanks.