There is the SDCH spec: Shared Dictionary Compression over HTTP. Google Chrome uses it, and the Google Toolbar adds support to IE. The server supplies a pre-cr

There is the SDCH spec: Shared Dictionary Compression over HTTP. Google Chrome uses it, and the Google Toolbar adds support to IE. The server supplies a pre-created dictionary (template) which gets cached, and further requests get a diff to that dictionary as a response. I've only found Google search using it on the server side, and the browser penetration is fairly low, but it seems promising. It makes requests very fast. I've also noticed that Google search serves image thumbnails as data:// URLs directly in the original response. They are going a long way to ensuring each page loads entirely in one request.