code: def post(self, *args):
          
          filepath = self.get_body_argument('filepath')
          if not self.fs.exists(filepath):
              raise tornado.web.HTTPError(404)
  
          Filewatcher.add_directory_to_watch(filepath)
          self.write({'msg':'Watcher added for {}'.format(filepath)})
docs: Start a new filewatcher at the specified path.