1. A computer-implemented method comprising: as implemented by one or more computing devices of a content delivery network (CDN) service provider configured with specific executable instructions, transmitting translation code to a content provider, wherein the content provider embeds the translation code in content provided in response to a content request from a client computing device, and wherein execution of the translation code by a client computing device instructs the client computing device to request translation information pertaining to routing information for resources included in the requested content; receiving a translation information request from the client computing device; generating translation information which instructs the client computing device to modify one or more resource identifiers associated with resources included in the content to generate one or more modified resource identifiers based on a popularity of a corresponding resource; and transmitting the generated translation information to the client computing device.