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Disclosed is a proxy server system to ensure that Web browser clients refresh expired content data stored in browser's local cache storage at correct timing regardless of client system clock delay.
English (United States)
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A caching proxy method for contents with expiration date
Disclosed is a proxy server system to ensure that Web browser clients refresh expired content data stored
in browser's local cache storage at correct timing regardless of client system clock delay.
Web browser client cache is a well known method to store content data on a client hard disk drive to
improve browser response.
Unless client cache data expires, a Web browser client uses the cache data and does not retrieve the
content again from the server through network.
A Web browser judges expiration of cached content from the content's expiration time and the system
current time, therefore it fails to refresh expired content if client system clock is slow.
The proxy server described in this disclosure modifies expiration control tag data in HTTP response header
and enforces that a Web browser reloads the expired content even if client system clock is slow .
[Processing flow ]
1. The proxy server receives a request from Web browser client, and it routes the request to the target
Web server. 2. The Web server receives the request from the proxy server, and sends back the content data for the
proxy server. 3. The proxy server receives the response data and check its expiration time( T1 ) on "Expires:" tag in the
HTTP response header. 4. The proxy server stores the response from Web server into its cache storage. then modifies expiration
date( T2 ) and send the content to client.
T2 is determined...