The Sec-CH-Save-Data client hint indicates whether the user agent intends to reduce data usage. It will be sent by default on all requests unless the permissions policy says otherwise. Explicitly requesting Sec-CH-Save-Data or modifying the CH-Save-Data permissions policy will prevent the old `Save-Data` header from being sent. Otherwise, the old header will not be affected.


The current `Save-Data` header is sent when a browser or operating system data saver setting is on (e.g., Lite mode) for all first and third party requests, lives outside the client hints system, and is named improperly. `Sec-CH-Save-Data` will be a proper client hint and its delegation to third parties could be prevented via permissions policies.


Specification link

Specification being incubated in a Community Group

Status in Chromium


Proposed (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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Last updated on 2022-05-14