4.11 Functionality to set expiry date
When you set the expiry date in the Web server contents, the client and the proxy server supporting the cache functionality do not access the Web server during that period and access their own cache, and hence this functionality is effective.
You can use expiry date setting functionality by embedding the mod_expires module in HTTP Server. You can use the expiry date setting functionality to execute the following operations:
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If you use the expiry date settings functionality, the Expires header and the Cache-Control header are added to response.
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With the Expires header the expiry date is set in the Greenwich standard time (GMT), and with the Cache-Control header the time up to the expiry date is set in seconds in the max-age directive.
The client and the proxy server handle the set Expires header and the Cache-Control header.
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