Pick the right CDN provider

Spawned from https://gitlab.com/gitlab-com/infrastructure/issues/57#note_32132521

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Picked Fastly

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To consider

Cloudfront

• https://aws.amazon.com/cloudfront/

Fastly

• https://www.fastly.com (setup within 24 hours for GitHub: https://www.fastly.com/customers/github/)

CDN77

• https://www.cdn77.com/

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Considered but discarded

CloudFlare

• Plans described on https://www.cloudflare.com/plans/
• I can use your help @briann @stanhu @pcarranza @andrewn @jtevnan in picking which one is right for us. The cost implications are significant for the more expensive plans.
• I'm wondering if we can even make do with the Free plan for now? https://www.cloudflare.com/plans/business/#compare-features
• @andrewn points out: "It seems, from reading the Cloudflare docs and from phoning their pre-sales support team, that Cloudflare doesn't support a classic CDN setup. Rather, they have to take over your DNS configuration for gitlab.com, which I feel is too risky for what we're trying to achieve here (which is a simple CDN setup)"

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