void Ns_ConnSetRequiredHeaders( Ns_Conn *conn, char *contentType, int contentLength );
The Ns_ConnSetRequiredHeaders function writes the required headers of the HTTP response. If contentType is NULL, it defaults to 'text/html'. If contentLength is 0, no contentLength
header will be written out.
The Ns_ConnReturnStatus function can be used to return a status-only response to the client.