The "safe" HTTP Preference
draft-nottingham-safe-hint-03

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Document Type Active Internet-Draft (candidate for appsawg WG)
Author Mark Nottingham 
Last updated 2014-08-05
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Network Working Group                                      M. Nottingham
Internet-Draft
Intended status: Standards Track                          August 6, 2014
Expires: February 7, 2015

                       The "safe" HTTP Preference
                     draft-nottingham-safe-hint-03

Abstract

   This specification defines a "safe" preference for HTTP requests,
   expressing a desire to avoid "objectionable" content.

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
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   This Internet-Draft will expire on February 7, 2015.

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   Copyright (c) 2014 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  The "safe" Preference . . . . . . . . . . . . . . . . . . . .   3
   3.  Implementation Status . . . . . . . . . . . . . . . . . . . .   4
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   5
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
   6.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   5
   Appendix A.  Acknowledgements . . . . . . . . . . . . . . . . . .   7
   Appendix B.  Setting "safe" from Web Browsers . . . . . . . . . .   7
   Appendix C.  Supporting "safe" on Web Sites . . . . . . . . . . .   7

1.  Introduction

   Many Web sites have a "safe" mode, to assist those who don't want to
   be exposed (or have their children exposed) to "objectionable"
   content.

   However, that goal is often difficult to achieve, because of the need
   to go to each Web site in turn, navigate to the appropriate page
   (possibly creating an account along the way) to get a cookie
   [RFC6265] set in the browser, for each browser on every device used.

   If this desire is proactively advertised by the user agent, things
   become much simpler.  A user agent that supports doing so (whether it
   be an individual browser, or through an Operating System HTTP
   library) need only be configured once to assure that the preference
   is advertised to all sites.

   Furthermore, a proxy (for example, at a school) can associate the
   preference with all (unencrypted) requests flowing through it,
   helping to assure that clients behind it are not exposed to
   "objectionable" content.

   This specification defines how to declare this desire in requests as
   a HTTP Preference [RFC7240].

   Note that this specification does not precisely define what "safe"
   is; rather, it is interpreted within the scope of each Web site that
   chooses to act upon this information (or not).

   That said, the intent of "safe" is to allow end users (or those
   acting on their behalf) to express a desire to avoid content that is
   considered "objectionable" within the cultural context of that site;
   usually (but not always) content that is unsuitable for minors.  The
   "safe" preference ought not be used for other purposes.

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   It is also important to note that the "safe" preference is not a
   reliable indicator that the end user is a child; other users might
   have a desire for unobjectionable content, and some children might
   browse without the preference being set.

   Simply put, it is a statement by (or on behalf of) the end user to
   the effect "If your site has a 'safe' setting, this user is hereby
   opting into that, according to your definition of the term."

1.1.  Notational Conventions

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
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