CDN mirroring cannot have the same host name as the application server, as you need a way for the CDN to explicitly reference the application.
Why, in general, sites such as facebook launch their CDN on a completely separate host, and not just on a subobject, for example cdn.facebook.com? Example:http://profile.ak.fbcdn.net/hprofile-ak-snc4/173706_6103645_790537_q.jpg
Is there a reason that they can create resource URLs with many different host names in order to avoid the 4-connection limit per host for some browsers?
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