The “Save-Data” header field is a boolean that, in requests, indicates client’s explicit opt-in for reduced data usage, due to high transfer costs, slow connection speeds, or other reasons. When communicated to origins, it allows them to deliver alternate content honoring such preference - e.g. smaller image and video resources, alternate "light mode" markup, etc.

Documentation

Specification

Editor's draft

Status in Chromium

Blink


Enabled by default (tracking bug) in:

  • Chrome for desktop release 49
  • Chrome for Android release 49
  • Chrome for iOS release 49
  • Android WebView release 49

Consensus & Standardization

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

  • No signal
  • No signal
  • No signal
  • Positive

Owner

Last updated on 2020-11-09