# Chapter 17. CDN

**URL:** <https://discuss.httparchive.org/t/chapter-17-cdn/1772>\
**Category:** 2019 Web Almanac\
**Created:** [October 31, 2019, 12:01am UTC](https://discuss.httparchive.org/t/chapter-17-cdn/1772 "2019-10-31T00:01:25Z")\
**Posts on this page:** 1\
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**Author:** ![mctaylorpants](https://yyz1.discourse-cdn.com/flex035/user_avatar/discuss.httparchive.org/mctaylorpants/32/1691_2.png) [@mctaylorpants](https://discuss.httparchive.org/u/mctaylorpants)\
**Post date:** [November 21, 2019, 5:43am UTC](https://discuss.httparchive.org/t/chapter-17-cdn/1772/2 "2019-11-21T05:43:09Z")

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Really enjoying the article so far! I wanted to point out a minor typo I just noticed in the “CDN adoption and usage” section:

> This slight variance is likely **do** to the small continued use of mobile specific web pages (“mDot”), which more frequently use a CDN.

(Edit) and another small one:

> Some CDNs support `post-check` as a method to allow a resource to **[be]** refreshed when it goes stale, and `pre-check` as a `maxage` equivalent.

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