LINE Notifyでメッセージ投稿

main();
function main(){
  var token = configs.get("token");
  var messageText = configs.get("Message");
  //check length of message
  messageCheck(messageText);
  //send message to LINE Notify API
  var response = httpClient.begin()
    .bearer(token)
    .multipart("message", messageText)
    .post('https://notify-api.line.me/api/notify');
  var responseText = response.getResponseAsString();
  engine.log(responseText)
  //check whether sending succeeded
  if (response.getStatusCode() != 200) {
    throw "Status Code is not 200." + response.getStatusCode();
  }
}
function messageCheck(messageText){
  if(messageText == null){
    throw "Message is empty."
  }else if(messageText.length() > 1000){
    throw("Message Length over 1000");
  }
}