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RE: ISSUE-121 Re: ACTION-84: Wiley to describe the reason for setting DNT=null

From: Shane Wiley <wileys@yahoo-inc.com>
Date: Fri, 10 Feb 2012 12:55:37 -0800
To: Karl Dubost <karld@opera.com>
CC: Tracking Protection Working Group WG <public-tracking@w3.org>
Message-ID: <63294A1959410048A33AEE161379C8023D0C8ACF5A@SP2-EX07VS02.ds.corp.yahoo.com>
Karl,

I believe we closed on this on the last WG call.  The action now is to develop a method for a site to poll a browser to see if it supports DNT and not require a <null> DNT: header field to do that.

- Shane

-----Original Message-----
From: Karl Dubost [mailto:karld@opera.com] 
Sent: Friday, February 10, 2012 1:52 PM
To: Shane Wiley
Cc: Tracking Protection Working Group WG
Subject: ISSUE-121 Re: ACTION-84: Wiley to describe the reason for setting DNT=null


Le 31 janv. 2012 à 00:08, Shane Wiley a écrit :
> Description:
> Wiley to describe the reason for setting DNT=null
>  
> Draft:
> <non-normative>
> As many User Agents may fall outside of the large web browser vendors, such as Apps, Toolbars, Custom Web Kits, etc., it will be helpful for publishers to receive a signal that a User Agent supports DNT even when a user has not yet provided a preference.
>  
> <normative>
> User Agents SHOULD provide a null DNT signal if the user has not yet provided a preference and the User Agent supports DNT. 

Shane to clarify the normative requirement. 
DNT is currently of the following form according to the specification.
http://www.w3.org/2011/tracking-protection/drafts/tracking-dnt.html#dnt-header-field

    DNT: 1
    DNT: 0 

* What is the 3rd syntax you are proposing? 
* A third syntax also means that servers will have to handle these following cases

    DNT: 1     ± (optin|optout)
    DNT: 0     ± (optin|optout)
    <dnt-null> ± (optin|optout) 
    <nothing>  ± (optin|optout)

Which starts to be a lot of business rules to implement on the server side.
The majority of user agents will have <nothing>: legacy user agents, bots, etc. scripts coded by users. Would it be possible to assume that <nothing> (aka no DNT header) is equivalent to <dnt-null>. If not what would be the issues?



 


-- 
Karl Dubost - http://dev.opera.com/
Developer Relations, Opera Software
Received on Friday, 10 February 2012 20:56:33 UTC

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