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Re:Google, Microsoft, Qualcomm and Baidu Announce Joint Inve... by manigandham on Tuesday September 22, 2015 @04:08PM (#10261328)
All of this is answered in their documentation [1] and admin console help text.

Most CDNs only cache in the local POP on the first request and respect the headers the origin sends. The crawl frequencies are for keeping things available if your origin is offline and depends on your plan as listed on the site.

1. https://support.cloudflare.com/hc/en-us/articles/200168256-W...

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