Simple Message to Slack Channel using Webhook (SSJS)

<script runat="server">
Platform.Load("Core","1");
try{
  var url = 'https://hooks.slack.com/services/xxxxxxxx/yyyyyyyyyyyy/zzzzzzzzzzzzzzzz';
  var contentType = 'text/plain';
  var payload = '{"text":"Now this is SSJS!"}';
  var headerNames = [];
  var headerValues = [];
  var result = HTTP.Post(url, contentType, payload, headerNames, headerValues);

  Write(result.StatusCode + '<br>');
  Write(result.Response);
} 
catch(error) {
Write('Message: '+ error);
}
</script>