It is a HTTP response header which is considered as a characteristic of Internet Explorer 8+, Chrome and Safari. This header is designed so as to enable the cross-site scripting (XSS) filter that is built into the modern web browsers. […]

Authentication signifies the process of identifying whether or not a client is eligible so as to access a resource. The HTTP protocol here supports authentication as a way of negotiating access to a secure resource. […]

This header encompasses the date/time after which the response is considered stale. Normally, such a stale cache entry might not be returned back by a cache (that is, maybe either a proxy cache or user agent cache) until and unless it’s first checked or validated with origin server (or maybe with any intermediate cache that holds a fresh copy of the entity). […]

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