在第一个查询中清空POST数据

Question

I have a strange problem with PHP script and sending data by POST.

Script source where I receive POST data:

<?php
print_r($GLOBALS);
?>

Script where I send POST data:

<?php
    $url = 'http://server.com/script.php';
    $data = array(
        "request" => '
        {
            "variable": "some data"
        }'
    );

    $options = array(
        'http' => array(
            'header'  => "Content-type: application/x-www-form-urlencoded
",
            'method'  => 'POST',
            'content' => http_build_query($data),
        ),
    );
    $context  = stream_context_create($options);
    echo $result = file_get_contents($url, false, $context);
?>

When I call this script first time it return:

Array ( [GLOBALS] => Array *RECURSION* [_POST] => Array ( ) [_GET] => Array ( ) [_COOKIE] => Array ( ) [_FILES] => Array ( ) )

When I repeat query it's OK - Array show POST data. After a few minutes it is again empty.

I tried set different settings in .htaccess file, but it does not help.

PS. Same script on other server works great.

Do you have any ideas?