HTTP Client Hints

Document Type Replaced Internet-Draft (candidate for httpbis WG)
Last updated 2015-10-14 (latest revision 2015-08-24)
Replaced by draft-ietf-httpbis-client-hints
Stream IETF
Intended RFC status (None)
Expired & archived
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Stream WG state Call For Adoption By WG Issued
Document shepherd No shepherd assigned
IESG IESG state Replaced by draft-ietf-httpbis-client-hints
Consensus Boilerplate Unknown
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Responsible AD (None)
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


An increasing diversity of Web-connected devices and software capabilities has created a need to deliver optimized content for each device. This specification defines a set of HTTP request header fields, colloquially known as Client Hints, to address this. They are intended to be used as input to proactive content negotiation; just as the Accept header allows clients to indicate what formats they prefer, Client Hints allow clients to indicate a list of device and agent specific preferences.


Ilya Grigorik (

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)