If calling this method has an effect (as per the previous paragraph), calling this method with <code>null</code> clears
 any content type set via a previous call to this method and clears any character encoding set via a previous call to
 this method, <a href="#setCharacterEncoding(java.lang.String)"><code>setCharacterEncoding(java.lang.String)</code></a> or <a href="#setLocale(java.util.Locale)"><code>setLocale(java.util.Locale)</code></a> but does not affect any default character encoding
 configured via 