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Is it possible to run ENTIRE site (not just images, etc) via CDN?
01-26-2012, 11:46 PM
Post: #36
RE: Is it possible to run ENTIRE site (not just images, etc) via CDN?
Unfortunately you're starting to get into the guts of the Internet plumbing and there is only so much that you can control. If your CDN uses anycast and is willing to let you use an IP address instead of a CNAME then you can configure your domain as an A record that points to their anycast address directly and give it as long of a TTL as you feel comfortable with. Combine that with a good DNS provider and that is the absolute best you are going to be able to do.

There is a lot of work going on elsewhere to try to help though:

- Google's DNS resolvers will automatically lookup names that are in it's cache and about to expire so it will always have a response available for users. Hopefully other resolvers will do the same but until then this requires that end-users configure their DNS to use Google's resolvers ( and I believe)

- Browsers are getting really aggressive about pre-fetching DNS and even pre-connecting. This is going to depend on how users get to your site though. In Chrome, users that come back frequently will have your host name resolved soon after starting the browser and may even establish connections while they are typing in the address (if it isn't a bookmark).

- If users come in through a search engine, things are improving there as well. Most search results in Google will have rel=prerender set for the first result if it's likely that the user will click. In Chrome it will actually fully load the page in a hidden tab and swap it in as soon as they click (in your case the page would be fully rendered).
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RE: Is it possible to run ENTIRE site (not just images, etc) via CDN? - pmeenan - 01-26-2012 11:46 PM

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