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Compression Dictionary Transport
Compression Dictionary Transport is a way of using a shared compression dictionary to dramatically reduce the transport size of HTTP responses.
When a resource is later requested that matches the given pattern (for example, app.v2.js), the request will include a SHA-256 hash of the available dictionary in the Available-Dictionary header, along with dcb and/or dcz values in the Accept-Encoding header (for delta compression using Brotli or ZStandard as appropriate): The server can then respond with an appropriately-encoded response with the chosen content encoding given in the Content-Encoding header: An optional id can also be provided in the Use-As-Dictionary header, to allow the server to more easily find the dictionary file if they do not store the diction by the hash:
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