response has been committed.
 <p>
 If calling this method has an effect on the locale (as per the previous paragraph), calling this method with
 <code>null</code> clears any locale set via a previous call to this method. If calling this method has an effect on the
 character encoding, calling this method with <code>null</code> clears the previously set character encoding.
 <p>
 Containers must communicate the locale and the character encoding used for the servlet response's writer to the
 client if the prot