This deals with the protocol and leaves the diff tool pluggable (RFC 3284's vcdiff is suggested), so it looks like something railgun could be using internally.

This deals with the protocol and leaves the diff tool pluggable (RFC 3284's vcdiff is suggested), so it looks like something railgun could be using internally. Google's SDCH (mentioned in CloudFlare's post) is an alternative that isn't tied to a single URL, but involves prefetching some data that may or may not be needed, so it's a bit hacky. An interesting approach would be to hook into a template engine to generate a page skeleton with dictionary references. That would allow reordering the small, newly generated varying snippets before the large common ones; both could be preemptively pushed using SPDY to avoid round-trips.