NS_IMETHODIMP
nsIsIndexFrame::OnSubmit(nsPresContext* aPresContext)
{
...
  // Begin ProcessAsURLEncoded
  nsAutoString data;

  nsCOMPtr<nsIUnicodeEncoder> encoder;
  if(NS_FAILED(GetEncoder(getter_AddRefs(encoder))))  // Non-fatal error
     encoder = nsnull;

  nsAutoString value;
  GetInputValue(value);
  URLEncode(value, encoder, data);
  // End ProcessAsURLEncoded
...
}