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Method and system for tiered distribution in a content delivery network

  • US 20080222281A1
  • Filed: 05/19/2008
  • Published: 09/11/2008
  • Est. Priority Date: 04/09/2002
  • Status: Active Grant
First Claim
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1. A server operating in a content delivery network (CDN) having an authoritative domain name service (DNS) and a set of servers organized into regions that provide content delivery on behalf of participating content providers, wherein the CDN also includes a set of CDN cache hierarchy nodes, comprising:

  • a processor;

    an operating system;

    a cache;

    memory in which content provider-specific metadata is stored, the content provider-specific metadata describing content handling requirements for given content provider content;

    code executable by the processor for determining whether a given object request can be serviced from the cache, the given object request associated with a first data string that has been resolved by the authoritative DNS to identify the server;

    code executable by the processor and responsive to a determination that the given object request cannot be serviced from the cache for evaluating content provider-specific metadata to determine whether the given object request is to be serviced by a CDN cache hierarchy node;

    code executable by the processor and responsive to a determination that the given object request is to be serviced by a CDN cache hierarchy node for directing a new request for the given object to a CDN cache hierarchy node intermediate the server and a source server identified in the content provider-specific metadata, where the new request is directed over a new connection to the CDN cache hierarchy node that the server opens, or over a persistent connection between the server and the CDN cache hierarchy node; and

    code executable by the processor to receive a response from the given CDN cache hierarchy node, where the response includes a content object associated with the given object request and time-to-live (TTL) information for the content object.

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