code: func (k *Kite) PostHandle(handler Handler) {
  	k.postHandlers = append(k.postHandlers, handler)
  }
docs: // PostHandle registers an handler which is executed after a kite.Handler
  // method is executed. Calling PostHandler multiple times registers multiple
  // handlers. A non-error return triggers the execution of the next handler. The
  // execution order is FIFO.