1. A computer-implemented method in a content delivery network (CDN), wherein the CDN serves content on behalf of one or more subscribers to the CDN, the method comprising: (A) responsive to a request at a server in said CDN, said request being associated with a particular CDN subscriber, determining a particular sequencer to handle the request, said particular sequencer comprising a sequence control object including (i) a sequence of multiple handlers, and (ii) one or more handler arguments associated with at least some of the multiple handlers, wherein the sequence control object is stored in compiled form, and wherein at least some of said multiple handlers are determined based on the at least some of said multiple handlers being uniquely associated with said particular CDN subscriber; and (B) processing the request at said server in said CDN in accordance with the particular sequencer by invoking the multiple handlers.