entType(java.lang.String)"><code>setContentType(java.lang.String)</code></a> before the response is committed. If no content type has been specified, this
 method returns null. If a content type has been specified, and a character encoding has been explicitly or implicitly
 specified as described in <a href="#getCharacterEncoding()"><code>getCharacterEncoding()</code></a> or <a href="#getWriter()"><code>getWriter()</code></a> has been called, the charset parameter
 is included in the string returned. If no 