A framework supporting content delivery and comprising a plurality of devices, each device configured to run at least one content delivery (CD) service of a plurality of CD services, wherein the plurality of CD services comprise: collector services, reducer services, fill services, and control services; and wherein at least some of the plurality of devices run fill services, and wherein the fill services running on the at least some of the plurality of devices comprise at least one fill services network. At least one the fill service is configured to obtain resources on behalf of other CD services in the CDN.