cter encoding. This method has no effect if it is called
 after <code>getWriter</code> has been called or after the response has been committed.
 <p>
 If calling this method has an effect (as per the previous paragraph), calling this method with <code>null</code> clears
 any character encoding set via a previous call to this method, <a href="#setCharacterEncoding(java.nio.charset.Charset)"><code>setCharacterEncoding(Charset)</code></a>,
 <a href="#setContentType(java.lang.String)"><code>setContentType(java.