The Geohash HTTP Client Hint
draft-geohash-hint-00
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Tommy Pauly
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2021-02-19
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Network Working Group T. Pauly
Internet-Draft Apple Inc.
Intended status: Experimental 19 February 2021
Expires: 23 August 2021
The Geohash HTTP Client Hint
draft-geohash-hint-00
Abstract
This documents defines an HTTP Client Hint for sharing a client's
rough location using the Geohash format.
Discussion Venues
This note is to be removed before publishing as an RFC.
Source for this draft and an issue tracker can be found at
https://github.com/tfpauly/privacy-proxy.
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet-
Drafts is at https://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
This Internet-Draft will expire on 23 August 2021.
Copyright Notice
Copyright (c) 2021 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents (https://trustee.ietf.org/
license-info) in effect on the date of publication of this document.
Please review these documents carefully, as they describe your rights
and restrictions with respect to this document. Code Components
Pauly Expires 23 August 2021 [Page 1]
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extracted from this document must include Simplified BSD License text
as described in Section 4.e of the Trust Legal Provisions and are
provided without warranty as described in the Simplified BSD License.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1. Requirements . . . . . . . . . . . . . . . . . . . . . . 3
2. Geohash Header . . . . . . . . . . . . . . . . . . . . . . . 3
3. Server Behavior . . . . . . . . . . . . . . . . . . . . . . . 3
3.1. Proxy Behavior . . . . . . . . . . . . . . . . . . . . . 4
4. Security Considerations . . . . . . . . . . . . . . . . . . . 4
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 4
5.1. HTTP Headers . . . . . . . . . . . . . . . . . . . . . . 4
6. References . . . . . . . . . . . . . . . . . . . . . . . . . 4
6.1. Normative References . . . . . . . . . . . . . . . . . . 4
6.2. Informative References . . . . . . . . . . . . . . . . . 5
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 5
1. Introduction
HTTP Client Hints [RFC8942] defines a convention for HTTP headers to
communicate optional information from clients to servers as hints.
This can be done conditionally based on if a server claims supports
for a particular hint.
This document defines a client hint that can be used to send a
location that the client wants to use for influencing server
behavior. It uses the Geohash algorithm [GEOHASH] to encode latitude
and longitude coordinates into an alphanumeric token that can be
truncated to provide a less specific location.
This header is intended to be used to provide rough geolocation hints
to servers in situations where the server cannot directly ascertain
the location of the client. For example, a client that is accessing
a server through a proxy or a VPN might provide a rough hint to a
server when looking up information that may vary depending on
location.
This document also defines a how forward proxies can use proxy status
fields to inform clients about the result of their Geohash hints.
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1.1. Requirements
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
"OPTIONAL" in this document are to be interpreted as described in
BCP 14 [RFC2119] [RFC8174] when, and only when, they appear in all
capitals, as shown here.
2. Geohash Header
The "Sec-CH-Geohash" is an Item Structured Header [RFC8941]. Its
value MUST be a String, and MUST have at least 1 character and no
more than 12 characters. The ABNF is:
Sec-CH-Geohash = sf-string
The string itself is an encoded Geohash, which uses the 32 different
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