SDCH is a shared dictionary compression mechanism developed by Google but not standardized. It's use in chrome is being discontinued. Intent to deprecate thread: https://groups.google.com/a/chromium.org/forum/#!searchin/blink-dev/SDCH%7Csort:relevance/blink-dev/nQl0ORHy7sw/HNpR96sqAgAJ

Status in Chromium

Internals>Network>Filters


Deprecated (tracking bug)

Consensus & Standardization

After a feature ships in Chrome, the values listed here are not guaranteed to be up to date.

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Owners

Last updated on 2021-08-29