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SDCH achieves its effectiveness by using pre-negotiated dictionaries to "warm up" its internal state prior to encoding or decoding. These may either be already stored locally, or uploaded from a source and then cached.
SDCH compression was removed from Google Chrome, and other Chromium products, in version 59 (2017-06-05).
- Butler, Jon; Wei-Hsin Lee; McQuade, Bryan; Mixter, Kenneth. "A Proposal for Shared Dictionary Compression Over HTTP" (PDF). Google.
- "SDCH Mailing List". Google Groups.
- "Intent to Unship: SDCH". Google. Retrieved 2017-05-02.