exception:object(OAuthException2)#3 (7) {
  ["message":protected]=>
  string(109) "Unexpected result from the server "https://api.xing.com/v1/request_token" () while requesting a request token"
  ["string":"Exception":private]=>
  string(0) ""
  ["code":protected]=>
  int(0)
  ["file":protected]=>
  string(95) "/var/www/vhosts/qrtool.de/smart-business-card.qrtool.de/httpdocs/includes/xing.auth.handler.php"
  ["line":protected]=>
  int(75)
  ["trace":"Exception":private]=>
  array(1) {
    [0]=>
    array(5) {
      ["file"]=>
      string(95) "/var/www/vhosts/qrtool.de/smart-business-card.qrtool.de/httpdocs/includes/xing.auth.handler.php"
      ["line"]=>
      int(226)
      ["function"]=>
      string(19) "requestRequestToken"
      ["class"]=>
      string(18) "XingOAuthRequester"
      ["type"]=>
      string(2) "::"
    }
  }
  ["previous":"Exception":private]=>
  NULL
}