[Name] maxstale [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 that has exceeded its expiration time (cf. 'max-stale' in HTTP 1.1 [RFC2616]). If maxstale is assigned a value, then the document is willing to accept content that has exceeded its expiration time by no more than the specified number of seconds.