Expires

Expires

 

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The Expires header gives a date and time at which the response is no longer valid. This allows clients such as your browser to cache a copy and not have to ask the server if it is still valid until after this time has expired.

Chapter 7discusses how the Expires header is usedin particular, how it relates to caches and having to revalidate responses with the origin server.

Type

Entity header

Basic Syntax

Expires: HTTP-date

Example

Expires: Thu, 03 Oct 1997 17:15:00 GMT