HTTP Pocket Reference by Clinton Wong

Author:Clinton Wong [Wong, Clinton]
Language: eng
Format: epub
Tags: Hypertext Systems, Web, Page Design, Networking, Electronic Books, Computers, Programming, General, Network Protocols, Data Processing, Internet, HTTP (Computer Network Protocol), Web Page Design
ISBN: 9781565928626
Publisher: O'Reilly Media
Published: 2000-01-02T08:00:00+00:00

* * *

The Pragma header specifies directives for proxy and gateway systems. Since many proxy systems may exist between a client and server, Pragma headers must pass through each proxy. When the Pragma header reaches the server, the header may be ignored by the server software.

The only directive defined in HTTP/1.0 is the no-cache directive. It is used to tell caching proxies to contact the server for the requested document, instead of using its local cache. This allows the client to request the most up-to-date document from the original web server, without receiving a cached copy from an intermediate proxy server.

The Pragma header is an HTTP 1.0 feature, and is maintained in HTTP 1.1 for backward compatibility. No new Pragma directives will be defined in the future.

Example:

Pragma: no-cache

Trailer: trailer_headers

Download

Copyright Disclaimer:
This site does not store any files on its server. We only index and link to content provided by other sites. Please contact the content providers to delete copyright contents if any and email us, we'll remove relevant links or contents immediately.