function doGet(e) {

  var exampleWebApp= UiApp.createApplication().setTitle('Example Webapp - Apps Script to Spreadsheets');

  var exampleFormUI = exampleWebApp.createGrid(3, 2);

  exampleFormUI.setWidget(0, 0, exampleWebApp.createLabel('Nick or Name:'));

  exampleFormUI.setWidget(0, 1, exampleWebApp.createTextBox().setName('nickName'));

  exampleFormUI.setWidget(1, 0, exampleWebApp.createLabel('Opinion:'));

  exampleFormUI.setWidget(1, 1, exampleWebApp.createTextBox().setName('opinion'));

  var boton = exampleWebApp.createButton('Send Comment');

  var clickHandler= exampleWebApp.createServerHandler('sendData');

  clickHandler.addCallbackElement(exampleFormUI);

  boton.addClickHandler(clickHandler);

  exampleWebApp.add(exampleFormUI);

  exampleWebApp.add(boton);

  return exampleWebApp;

}