Expect-CT is an HTTP header that allows sites to opt in to reporting and/or enforcement of Certificate Transparency requirements, which prevents the use of misissued certificates for that site from going unnoticed. When a site enables the Expect-CT header, they are requesting that Chrome check that any certificate for that site appears in public CT logs.

Specification

Editor's draft

Status in Chromium

Internals>Network>CertTrans


Enabled by default (tracking bug) in:

  • Chrome for desktop release 61
  • Chrome for Android release 61

Consensus & Standardization

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

  • Positive
  • No signal
  • No signal
  • Positive

Owner

Search tags

header,

Last updated on 2020-11-09