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HTTP Caching: Difference between revisions
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→ETag Based Caching
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If it is easy to generate a unique identifier that always changes when the response changes you can use that as an ETag identifier. This is done using the [[ETag Header]]: | If it is easy to generate a unique identifier that always changes when the response changes you can use that as an ETag identifier. This is done using the [[ETag Header]]: | ||
ETag: W/"my-unique-identifier" | |||
Cache-Control: public,maxage=5,must-revalidate | |||
This example will ask the cache to keep serving this response to requests coming in in the next 5 seconds. If a matching request comes in after the five seconds the cache will check whether it still has the last version using the [[If-None-Match header]]. | This example will ask the cache to keep serving this response to requests coming in in the next 5 seconds. If a matching request comes in after the five seconds the cache will check whether it still has the last version using the [[If-None-Match header]]. | ||