Compression Dictionary Transport

Compression Dictionary Transport is a way of using a shared compression dictionary, rather than the standard static dictionary in Brotli compression or Zstandard compression, to dramatically reduce the transport size of HTTP responses.

For example, when downloading app.v2.js, if the client already has app.v1.js then they can reference text from that by using it as a dictionary and effectivelly only download the delta and a small amount of references to the v1 file.

See the Compression Dictionary Transport guide for more information.