1. A computer-implemented method in a content delivery network (CDN), the method comprising, at a mechanism in said CDN: (A) responsive to a request, determining a particular sequencer to handle the request, said particular sequencer comprising a sequence of one or more handlers, wherein said request is associated with a particular customer of said CDN and wherein a first at least some of said one or more handlers in said particular sequence are determined based on said particular customer; and (B) processing the request in accordance with the particular sequencer by invoking the one or more handlers.