If-Unmodified-Since

If-Unmodified-Since

 


 

 

The If-Unmodified-Since header is the twin of the If-Modified-Since header. Including it in a request makes the request conditional. The server should look at the date value of the header and return the object only if it has not been modified since the date provided. Chapter 7discusses conditional requests in detail.

Type

Request header

Basic Syntax

If-Unmodified-Since: HTTP-date

Example

If-Unmodified-Since: Thu, 03 Oct 1997 17:15:00 GMT

 



HTTP. The Definitive Guide
HTTP: The Definitive Guide
ISBN: 1565925092
EAN: 2147483647
Year: 2001
Pages: 294

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