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Compression Dictionary Transport

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Compression Dictionary Transport is a way of using a shared compression dictionary, rather than the standard static dictionary in {{glossary("Brotli compression")}} or {{glossary("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 effectively only download the delta and a small amount of references to the v1 file.

See the Compression Dictionary Transport guide for more information.

See also