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RE: tracking-ISSUE-121: Should a user agent advertise its DNT ability by, e.g., sending DNT;NULL [Tracking Preference Expression (DNT)]

From: Shane Wiley <wileys@yahoo-inc.com>
Date: Wed, 1 Feb 2012 06:48:04 -0800
To: Nicholas Doty <npdoty@w3.org>, Tracking Protection Working Group WG <public-tracking@w3.org>
Message-ID: <63294A1959410048A33AEE161379C8023D0C425AA9@SP2-EX07VS02.ds.corp.yahoo.com>
Nick,

The publisher may request an exception proactively if they see that DNT is available to the user agent but not yet activated (may be required in some legal jurisdictions).

Why would a user NOT wish for their user agent to broadcast its ability to support DNT?

- Shane

-----Original Message-----
From: Nicholas Doty [mailto:npdoty@w3.org] 
Sent: Wednesday, February 01, 2012 7:41 AM
To: Tracking Protection Working Group WG; Shane Wiley
Subject: Re: tracking-ISSUE-121: Should a user agent advertise its DNT ability by, e.g., sending DNT;NULL [Tracking Preference Expression (DNT)]

Apologies if I'm repeating questions from the f2f but I'm still uncertain about the use cases for this proposal. 

What would a server/publisher do differently if it received DNT:null than if it didn't receive a DNT header at all? Why would a user wish to broadcast their user agent's ability when they hadn't yet expressed a preference?

-Nick

On Jan 31, 2012, at 1:33 AM, Tracking Protection Working Group Issue Tracker wrote:
> tracking-ISSUE-121: Should a user agent advertise its DNT ability by, e.g., sending DNT;NULL [Tracking Preference Expression (DNT)]
> 
> http://www.w3.org/2011/tracking-protection/track/issues/121
> 
> Raised by: Shane Wiley
> On product: Tracking Preference Expression (DNT)
> 
> 2012-01-30 Shane said:
> 
> <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. 
> 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.  
Received on Wednesday, 1 February 2012 14:49:04 UTC

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