[Required] false [Type] ECMAScript Expression [Default Value] none [Valid Values] A valid time value for the HTTP 1.1 request [RFC2616] [Description] The character string returned must be interpreted as a time interval. This indicates that the document is willing to use content whose age is no greater than the specified time in seconds (cf. 'max-age' in HTTP 1.1 [RFC2616] ). The document is not willing to use stale content, unless maxstale is also provided. [Name] 
maxage