1. A computer-implemented method, in a content delivery (CD) network (CDN), the CDN serving content on behalf of a plurality of subscribers to the CDN, said CDN comprising multiple delivery service endpoints running on a plurality of devices, each of said delivery service endpoints constructed and adapted to deliver resources, a plurality of said multiple delivery service endpoints comprising a group, wherein each CD node in said group has at least one kind of responsibility relating to delivery of resources for said CDN, the method comprising: (A) receiving a request at a first CD node in said group, wherein the group comprises one or more subclusters, and wherein the one or more subclusters comprise a first supercluster, and wherein said group comprises a super-cluster of said plurality of nodes of said multiple delivery service endpoints, and wherein the group comprises a peer group of said multiple delivery service endpoints; and then, (B) based on what kind of responsibility said first CD node has for said request, as determined by said first CD node, attempting to process the request at a second CD node outside the peer group, wherein the request relates to a particular resource, and wherein said attempting to process in (B) is also based on (i) a resource type of said particular resource, and (ii) at least one kind responsibility said first CD node has for requests relating to said particular resource, wherein the kind of responsibility the first CD node has for the particular resource is defined in a policy associated with the particular resource, and wherein the policy is defined for a group of resources.