return an empty directive . this is well suited for using other optional directives without `` max-age '' , `` no-cache '' or `` no-store '' . concode_field_sep long maxAge concode_elem_sep boolean cachePrivate concode_elem_sep boolean noTransform concode_elem_sep long sMaxAge concode_elem_sep boolean mustRevalidate concode_elem_sep boolean cachePublic concode_elem_sep boolean noCache concode_elem_sep boolean noStore concode_elem_sep boolean proxyRevalidate concode_field_sep CacheControl noCache concode_elem_sep CacheControl maxAge concode_elem_sep CacheControl cachePublic concode_elem_sep CacheControl noTransform concode_elem_sep CacheControl proxyRevalidate concode_elem_sep CacheControl mustRevalidate concode_elem_sep String getHeaderValue concode_elem_sep CacheControl sMaxAge concode_elem_sep void appendDirective concode_elem_sep CacheControl noStore concode_elem_sep CacheControl cachePrivate
CacheControl function ( ) { return new CacheControl ( ) ; }