Integrating mirroring and caching - theory
Individual Web Caches can run redirector scripts which selectively rewrite some of the URLs requested from them, e.g. from:
ftp://ftp.gnome.org/pub/GNOMEto:
ftp://ftp.net.lut.ac.uk/gnome
(etc)
But ideally the Mirror service would advertise itself as 'best match' Web Cache for both the original resource and known high quality replicas.