怎么解决PHP SOAP-ERROR问题

PHP Fatal error:  Uncaught SoapFault exception: [WSDL] SOAP-ERROR: Parsing WSDL: Couldn't load from 'https://xxxx.com'.

$opts = array(
            'http' => array(
                'user_agent' => 'PHPSoapClient'
            ),
            'ssl'   => array(
               'verify_peer'          => false
            ),
        );
        $context = stream_context_create($opts);
$requestUrl = 'https://labelserver.endicia.com/LabelService/EwsLabelService.asmx?wsdl';
        $client = new SoapClient($requestUrl, array("trace" => 1, "cache_wsdl" => WSDL_CACHE_NONE, "exception" => 1, 'stream_context' => $context));

openssl_get_cert_locations()
rray(8) {
  ["default_cert_file"]=>
  string(21) "/usr/lib/ssl/cert.pem"
  ["default_cert_file_env"]=>
  string(13) "SSL_CERT_FILE"
  ["default_cert_dir"]=>
  string(18) "/usr/lib/ssl/certs"
  ["default_cert_dir_env"]=>
  string(12) "SSL_CERT_DIR"
  ["default_private_dir"]=>
  string(20) "/usr/lib/ssl/private"
  ["default_default_cert_area"]=>
  string(12) "/usr/lib/ssl"
  ["ini_cafile"]=>
  string(0) ""
  ["ini_capath"]=>
  string(0) ""