can be used by a user agent to give information about the presence or absence of certain features in the feature set of the current request.
Quick facts
Description
can be used by a user agent to give information about the presence or absence of certain features in the feature set of the current request.
Syntax
Accept-Features: <value>
Frequently asked questions
can be used by a user agent to give information about the presence or absence of certain features in the feature set of the current request.
It is classified as a request header and can appear in requests or responses depending on context.
Sources & standards
Updated 2026-08-18