March 2003
Intermediate to advanced
312 pages
7h 12m
English
Content preview from HTTP Developer’s Handbook
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Pragma
The Pragma header is the primary method for controlling caching behavior in HTTP/1.0. Because HTTP/1.1 introduces the more flexible Cache-Control general header, use of the Pragma header is dwindling. Most developers who make use of the Pragma header do so as a safety measure only in order to support Web clients that might not be compliant with HTTP/1.1.
Additionally, because the Pragma header was replaced as more control over caching became necessary, it was only implemented with one possible form:
Pragma: no-cache
Although other forms are allowed by the specification (in order to remain flexible to future implementations), the use of the Cache-Control general header has curtailed the use of any other forms of the Pragma header.
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