当我使用wsdl和端点url执行我的curl php请求时获得空白响应

Question

请帮助我，当我执行我的curl php请求和wsdl，端点url时得到空白响应。

这是我的代码：

//end point url      
$e_url="https://tmcrmportal.inservices.tatamotors.com/home/B2C/com.eibus.web.soa
        p.Gateway.wcp?organization=o=B2C;cn=cordys,cn=cbop,o=tatamotors.com";

//wsdl
$wsdl="WSDL";

//$curl = curl_init($e_url);
//request
$xml_post_string = '<?xml version="1.0"?>
<SOAP:Envelope xmlns:SOAP=\"http://schemas.xmlsoap.org/soap/envelope/\">
<SOAP:Header>
<wsse:Security xmlns:wsse=\"http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd\">
<wsse:UsernameToken xmlns:wsse=\"http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd\">
<wsse:Username>username</wsse:Username>
<wsse:Password>pwd</wsse:Password>
</wsse:UsernameToken>
</wsse:Security>
</SOAP:Header>
<SOAP:Body>
<samlp:Request IssueInstant=\"2004-12-05T09:21:59Z\" MajorVersion=\"1\" MinorVersion=\"1\" RequestID=\"456789\" xmlns:samlp=\"urn:oasis:names:tc:SAML:1.0:protocol\">
<samlp:AuthenticationQuery>
<saml:Subject xmlns:saml=\"urn:oasis:names:tc:SAML:1.0:assertion\">
<saml:NameIdentifier Format=\"urn:oasis:names:tc:SAML:1.1:nameid-format:unspecified\">username</saml:NameIdentifier>
</saml:Subject>
</samlp:AuthenticationQuery>
</samlp:Request>
</SOAP:Body>
</SOAP:Envelope>';




       $headers = array(
            "Content-type: text/xml;charset="utf-8"",
            "Accept: text/xml",
            "Cache-Control: no-cache",
            "Pragma: no-cache",
            "SOAPAction: "run"",
            "Content-length: ".strlen($xml_post_string),
        );


        $ch = curl_init("ENDPOINTURL");

        curl_setopt($ch, CURLOPT_URL, $wsdl);
        curl_setopt($ch, CURLOPT_POST, 1);
        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $xml_post_string);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_VERBOSE, 0);
        curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);


if(curl_exec($ch) === false) {
    $err = 'Curl error: ' . curl_error($ch);
    print $err;
    curl_close($ch);
} else {
    $response = curl_exec($ch);
    print $response.'Operation completed without any errors';
    curl_close($ch);
}