This feature adds a set of restrictions upon the names which may be used for cookies with specific properties. These restrictions enable user agents to smuggle cookie state to the server within the confines of the existing "Cookie" request header syntax, and limits the ways in which cookies may be abused. In a nutshell: `__Secure-*` cookies have to have the `Secure` flag, and `__Host-*` cookies have to have `Path=/`, can't have `Domain`, and might require `Secure` (depending on the setter).



Editor's draft

Status in Chromium


Enabled by default (tracking bug) in:

  • Chrome for desktop release 49
  • Chrome for Android release 49

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 2020-11-09