Browse Prior Art Database

Handling Corrupted Data in Proxy Server

IP.com Disclosure Number: IPCOM000122820D
Original Publication Date: 1998-Jan-01
Included in the Prior Art Database: 2005-Apr-04
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Knox, AR: AUTHOR [+2]

Abstract

The proxy server not only enhances network applications such as the Internet by providing security but also increases performance by caching data locally.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 100% of the total text.

Handling Corrupted Data in Proxy Server

      The proxy server not only enhances network applications such as
the Internet by providing security but also increases performance by
caching data locally.

      However, when the cached data becomes corrupted (for instance
when the connection between the proxy and the webserver is
temporarily interrupted), there is no way for the user to have the
cache flushed and he/she must wait for it to expire before the proxy
will re-request the correct data from the external webserver.

      This problem can be overcome as described here by providing the
web browser with a purge instruction.  The user is then able to
instruct the proxy immediately to purge the corrupt page and reload
it from the webserver without requiring the intervention of the
administrator who controls the proxy server.

      The HTTP protocol (see Internet RFC 1945) defines certain
'methods' of communication such as GET and POST.  These methods
operate on web pages which are identified using a Universal Resource
Locator (URL).  The purge function may conveniently be implemented by
defining a further method called PURGE.  The web browser can use this
method to purge a web page from the proxy server.  If a purge request
is received by a web server, rather than a proxy server, the request
is either ignored or an error message is returned.