soap hlavička v php

prosím byl by tu někdo kdo by mi poradil co dělám špatně?

$g_soap = @new SoapClient($to.'?wsdl');
$header_part = '
<wsse:Security soap:mustUnderstand="1">
    <wsu:Timestamp wsu:Id="Timestamp-781c4afa-27ec-4a14-acd4-e5d9d08f1221">
        <wsu:Created>2012-02-21T08:22:14Z</wsu:Created>
        <wsu:Expires>2012-02-23T08:27:14Z</wsu:Expires>
    </wsu:Timestamp>
    <wsse:UsernameToken xmlns:wsu="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd" wsu:Id="SecurityToken-27e20ce2-b3da-42e6-ae63-51aa0337ff34">
        <wsse:Username>'.$pid.'\\'.$username.'</wsse:Username>
        <wsse:Password Type="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-username-token-profile-1.0#PasswordText">'.$password.'</wsse:Password>
        <wsu:Created>'.date('Y-m-d').'T'.date('H:i:s').'Z</wsu:Created>
    </wsse:UsernameToken>
</wsse:Security>
';
$Security_header = new SoapVar( $header_part, XSD_ANYXML, null, null, null );
$soap_header[] = new SoapHeader( 'http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd', 'Header', $Security_header,true );
$g_soap->__setSoapHeaders($soap_header);
$ws_info = array('requestXml'=>array('Xrg'=>array('Ws-info'=>array('Typ-pozadavku'=>'kompletni'))));
$response = $g_soap->__soapCall('WsInfo',$ws_info,NULL,$soap_header);

obsah $header_part je už samotná hlavička. obsah této proměnné má být obalen jen <soap:header> ... Když nyní tento skript spustím obdržím následující hlášku

PHP Fatal error: Uncaught SoapFault exception: [HTTP] Bad Request in C:\wwwroot\docs\soap_g\soap_client.php:38
Stack trace:
#0 [internal function]: SoapClient->__doRequest('<?xml version="...', 'xxx.xx.x...', 'www.xxxx...', 1, 0)
#1 C:\wwwroot\docs\soap_g\soap_client.php(38): SoapClient->__soapCall('WsInfo', Array, NULL, Array)
#2 {main}
thrown in C:\wwwroot\docs\soap_g\soap_client.php on line 38