SDCH

SDCH (Shared Dictionary Compression for HTTP) is a data compression algorithm created by Google, based on VCDIFF (RFC 3284).

For the Partido Socialdemocracia Chilena, also known by the initials SDCH, see Chilean Social Democracy Party.

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.

It was supported natively in Google Chrome, Chromium, and Android, as well as on Google websites.[1][2]

SDCH compression was removed from Google Chrome, and other Chromium products, in version 59 (2017-06-05).[3]

See also

References
  1. Butler, Jon; Wei-Hsin Lee; McQuade, Bryan; Mixter, Kenneth. "A Proposal for Shared Dictionary Compression Over HTTP" (PDF). Google.
  2. "SDCH Mailing List". Google Groups.
  3. "Intent to Unship: SDCH". Google. Retrieved 2017-05-02.


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