# Is there a way to tell when ESI cache was refreshed?

**URL:** <https://forums.eveonline.com/t/is-there-a-way-to-tell-when-esi-cache-was-refreshed/79759>\
**Category:** Third Party Developers\
**Tags:** esi\
**Created:** [May 31, 2018, 1:56pm UTC](https://forums.eveonline.com/t/is-there-a-way-to-tell-when-esi-cache-was-refreshed/79759 "2018-05-31T13:56:08Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![Piotr\_Leusten](https://sea1.discourse-cdn.com/eveonline/user_avatar/forums.eveonline.com/piotr_leusten/32/169358_2.png) [@Piotr\_Leusten](https://forums.eveonline.com/u/Piotr_Leusten)\
**Post date:** [May 31, 2018, 1:56pm UTC](https://forums.eveonline.com/t/is-there-a-way-to-tell-when-esi-cache-was-refreshed/79759/1 "2018-05-31T13:56:08Z")

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I apologize if this has been addressed before, but I’ve looked and can’t find an answer.

I know, for instance, that the ESI market data has a five-minute cache on it. Is there any way to tell just exactly WHEN the cache was last refreshed?

I don’t see anything in the response header, and I don’t really want to write a script that hits the endpoint every 10 seconds for five minutes so I can see when the data changes.

I’m talking about data that is so commonly requested that the cache reliably refreshes every five minutes. I’m trying to answer the question “does it refresh on the hour, 1 minute after, 2 minutes after, etc.”

Thanks!

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**Author:** ![Blacksmoke16](https://sea1.discourse-cdn.com/eveonline/user_avatar/forums.eveonline.com/blacksmoke16/32/376589_2.png) [@Blacksmoke16](https://forums.eveonline.com/u/Blacksmoke16)\
**Post date:** [May 31, 2018, 2:09pm UTC](https://forums.eveonline.com/t/is-there-a-way-to-tell-when-esi-cache-was-refreshed/79759/2 "2018-05-31T14:09:24Z")

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[https://developers.eveonline.com/blog/article/esi-etag-best-practices](https://developers.eveonline.com/blog/article/esi-etag-best-practices)

Along with the `Last-Modified` header can give you a good indication.

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**Author:** ![EveDataRules](https://sea1.discourse-cdn.com/eveonline/user_avatar/forums.eveonline.com/evedatarules/32/52946_2.png) [@EveDataRules](https://forums.eveonline.com/u/EveDataRules)\
**Post date:** [May 31, 2018, 2:48pm UTC](https://forums.eveonline.com/t/is-there-a-way-to-tell-when-esi-cache-was-refreshed/79759/3 "2018-05-31T14:48:37Z")

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CacheUntil?

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**Author:** ![Piotr\_Leusten](https://sea1.discourse-cdn.com/eveonline/user_avatar/forums.eveonline.com/piotr_leusten/32/169358_2.png) [@Piotr\_Leusten](https://forums.eveonline.com/u/Piotr_Leusten)\
**Post date:** [May 31, 2018, 2:58pm UTC](https://forums.eveonline.com/t/is-there-a-way-to-tell-when-esi-cache-was-refreshed/79759/4 "2018-05-31T14:58:30Z")

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Thanks. That’s what I was looking for.

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**Author:** ![system](https://global.discourse-cdn.com/eveonline/original/3X/4/1/41ec4921cbaca7a6f9ea556e7cc20018461eae5e.png) [@system](https://forums.eveonline.com/u/system)\
**Post date:** [August 29, 2018, 2:58pm UTC](https://forums.eveonline.com/t/is-there-a-way-to-tell-when-esi-cache-was-refreshed/79759/5 "2018-08-29T14:58:32Z")

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