Compression Dictionary Transport is an experimental HTTP feature that dramatically reduces response sizes by using shared compression dictionaries. It works by allowing servers to reference previously downloaded resources as dictionaries for compressing new content, achieving order-of-magnitude better compression than standard algorithms. The technique is particularly effective for delta compression of library updates where most code remains unchanged between versions. Implementation requires specific HTTP headers like Use-As-Dictionary and Available-Dictionary, with support for both Brotli and ZStandard algorithms.
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