1. A computer-implemented method operable in a content delivery network (CDN), and operable on a device comprising hardware including memory and at least one processor, the method comprising: (A) receiving a first request at a first content delivery (CD) service instance; (B) determining a first request environment from said first request; (C) determining a second request environment using (i) said first request environment, and (ii) information from sources other than the first request, said second request environment being distinct from said first request environment; and (D) attempting to process said first request using said second request environment, wherein said attempting to process in (D) comprises: (D)(1) causing at least some of said first request to be processed by a second CD service instance, wherein said second CD service instance is a peer of said first CD service instance, and wherein the first request is for requested content, wherein the requested content comprises a specific subscriber property and wherein the information from other sources comprises behavior information for said specific subscriber property.