ISSUE-78: What is the difference between absence of DNT request header and DNT = 0?

What is the difference between absence of DNT request header and DNT = 0?

State:
CLOSED
Product:
Tracking Preference Expression (DNT)
Raised by:
Opened on:
2011-09-22
Description:
2011-12-21 telco: We agreed that absence of a DNT request header can be caused by DNT being 'not enabled' or not present in a user agent.
- There is need for further clarifying the DNT=0 semantics.
Related Actions Items:
No related actions
Related emails:
  1. revised text for ISSUE-78 (from fielding@gbiv.com on 2012-02-13)
  2. Re: meaning of DNT 1 and DNT 0 when sent by user agents [ISSUE-78] (from singer@apple.com on 2012-01-20)
  3. Re: meaning of DNT 1 and DNT 0 when sent by user agents [ISSUE-78] (from npdoty@w3.org on 2012-01-20)
  4. Re: meaning of DNT 1 and DNT 0 when sent by user agents [ISSUE-78] (from npdoty@w3.org on 2012-01-20)
  5. Re: tracking-ISSUE-117: Terms: tracking v. cross-site tracking [Tracking Definitions and Compliance] (from fielding@gbiv.com on 2012-01-20)
  6. Re: meaning of DNT 1 and DNT 0 when sent by user agents [ISSUE-78] (from singer@apple.com on 2012-01-18)
  7. Re: meaning of DNT 1 and DNT 0 when sent by user agents [ISSUE-78] (from sharvey@google.com on 2012-01-18)
  8. Re: meaning of DNT 1 and DNT 0 when sent by user agents [ISSUE-78] (from rigo@w3.org on 2012-01-18)
  9. Re: meaning of DNT 1 and DNT 0 when sent by user agents [ISSUE-78] (from derhoermi@gmx.net on 2012-01-18)
  10. Re: meaning of DNT 1 and DNT 0 when sent by user agents [ISSUE-78] (from john@consumerwatchdog.org on 2012-01-17)
  11. Re: meaning of DNT 1 and DNT 0 when sent by user agents [ISSUE-78] (from sharvey@google.com on 2012-01-17)
  12. Re: meaning of DNT 1 and DNT 0 when sent by user agents [ISSUE-78] (from rigo@w3.org on 2012-01-17)
  13. RE: meaning of DNT 1 and DNT 0 when sent by user agents [ISSUE-78] (from kevsmith@adobe.com on 2012-01-17)
  14. Re: meaning of DNT 1 and DNT 0 when sent by user agents [ISSUE-78] (from dwainberg@appnexus.com on 2012-01-17)
  15. Re: meaning of DNT 1 and DNT 0 when sent by user agents [ISSUE-78] (from rigo@w3.org on 2012-01-17)
  16. Re: meaning of DNT 1 and DNT 0 when sent by user agents [ISSUE-78] (from fielding@gbiv.com on 2012-01-17)
  17. Re: meaning of DNT 1 and DNT 0 when sent by user agents [ISSUE-78] (from derhoermi@gmx.net on 2012-01-17)
  18. RE: meaning of DNT 1 and DNT 0 when sent by user agents [ISSUE-78] (from kevsmith@adobe.com on 2012-01-16)
  19. Re: meaning of DNT 1 and DNT 0 when sent by user agents [ISSUE-78] (from jmayer@stanford.edu on 2012-01-16)
  20. Re: meaning of DNT 1 and DNT 0 when sent by user agents [ISSUE-78] (from fielding@gbiv.com on 2012-01-16)
  21. Re: meaning of DNT 1 and DNT 0 when sent by user agents [ISSUE-78] (from jmayer@stanford.edu on 2012-01-16)
  22. Re: meaning of DNT 1 and DNT 0 when sent by user agents [ISSUE-78] (from jmayer@stanford.edu on 2012-01-16)
  23. Re: meaning of DNT 1 and DNT 0 when sent by user agents [ISSUE-78] (from fielding@gbiv.com on 2012-01-16)
  24. RE: meaning of DNT 1 and DNT 0 when sent by user agents [ISSUE-78] (from wileys@yahoo-inc.com on 2012-01-16)
  25. Re: meaning of DNT 1 and DNT 0 when sent by user agents [ISSUE-78] (from jmayer@stanford.edu on 2012-01-16)
  26. RE: meaning of DNT 1 and DNT 0 when sent by user agents [ISSUE-78] (from wileys@yahoo-inc.com on 2012-01-16)
  27. Re: tracking-ISSUE-105: Response header without request header? [Tracking Preference Expression (DNT)] (from mts@zurich.ibm.com on 2012-01-16)
  28. RE: meaning of DNT 1 and DNT 0 when sent by user agents [ISSUE-78] (from oeisen@adtruth.com on 2012-01-14)
  29. Fwd: meaning of DNT 1 and DNT 0 when sent by user agents [ISSUE-78] (from aleecia@aleecia.com on 2012-01-14)
  30. Re: meaning of DNT 1 and DNT 0 when sent by user agents [ISSUE-78] (from fielding@gbiv.com on 2012-01-13)
  31. Re: meaning of DNT 1 and DNT 0 when sent by user agents [ISSUE-78] (from tom@mozilla.com on 2012-01-13)
  32. Re: meaning of DNT 1 and DNT 0 when sent by user agents [ISSUE-78] (from singer@apple.com on 2012-01-13)
  33. RE: meaning of DNT 1 and DNT 0 when sent by user agents [ISSUE-78] (from kevsmith@adobe.com on 2012-01-13)
  34. Re: meaning of DNT 1 and DNT 0 when sent by user agents [ISSUE-78] (from john@consumerwatchdog.org on 2012-01-13)
  35. Re: meaning of DNT 1 and DNT 0 when sent by user agents [ISSUE-78] (from tom@mozilla.com on 2012-01-13)
  36. Re: meaning of DNT 1 and DNT 0 when sent by user agents [ISSUE-78] (from rigo@w3.org on 2012-01-13)
  37. Re: meaning of DNT 1 and DNT 0 when sent by user agents [ISSUE-78] (from tom@mozilla.com on 2012-01-12)
  38. meaning of DNT 1 and DNT 0 when sent by user agents [ISSUE-78] (from fielding@gbiv.com on 2012-01-12)
  39. diff of TPE editing since the FPWD (from fielding@gbiv.com on 2012-01-10)
  40. Re: Request to close ISSUE-78 (from derhoermi@gmx.net on 2011-12-22)
  41. Re: Request to close ISSUE-78 (from derhoermi@gmx.net on 2011-12-22)
  42. Re: Request to close ISSUE-78 (from sid@mozilla.com on 2011-12-21)
  43. Re: Request to close ISSUE-78 (from sid@mozilla.com on 2011-12-21)
  44. Re: tracking-ISSUE-105: Response header without request header? [Tracking Preference Expression (DNT)] (from mts@zurich.ibm.com on 2011-12-21)
  45. RE: Request to close ISSUE-78 (from jccannon@microsoft.com on 2011-12-21)
  46. RE: Request to close ISSUE-78 (from jccannon@microsoft.com on 2011-12-21)
  47. Re: Request to close ISSUE-78 (from fielding@gbiv.com on 2011-12-20)
  48. Re: Request to close ISSUE-78 (from sid@mozilla.com on 2011-12-20)
  49. Re: Request to close ISSUE-78 (from singer@apple.com on 2011-12-20)
  50. RE: Request to close ISSUE-78 (from kevsmith@adobe.com on 2011-12-20)
  51. Re: Request to close ISSUE-78 (from fielding@gbiv.com on 2011-12-20)
  52. Re: tracking-ISSUE-105: Response header without request header? [Tracking Preference Expression (DNT)] (from john@consumerwatchdog.org on 2011-12-20)
  53. RE: tracking-ISSUE-105: Response header without request header? [Tracking Preference Expression (DNT)] (from kevsmith@adobe.com on 2011-12-20)
  54. RE: Request to close ISSUE-78 (from kevsmith@adobe.com on 2011-12-20)
  55. Re: tracking-ISSUE-105: Response header without request header? [Tracking Preference Expression (DNT)] (from mts@zurich.ibm.com on 2011-12-20)
  56. Re: Request to close ISSUE-78 (from tlr@w3.org on 2011-12-20)
  57. Re: Request to close ISSUE-78 (from singer@apple.com on 2011-12-20)
  58. RE: Request to close ISSUE-78 (from kevsmith@adobe.com on 2011-12-20)
  59. RE: Request to close ISSUE-78 (from wileys@yahoo-inc.com on 2011-12-20)
  60. Proposed Agenda for 2011-12-21 TPWG call (from mts@zurich.ibm.com on 2011-12-20)
  61. Request to close ISSUE-78 (from mts@zurich.ibm.com on 2011-12-20)
  62. RE: Proposed Agenda for 2011-11-30 TPWG call (from wileys@yahoo-inc.com on 2011-11-30)
  63. RE: Proposed Agenda for 2011-11-30 TPWG call (from wileys@yahoo-inc.com on 2011-11-30)
  64. Proposed Agenda for 2011-11-30 TPWG call (from mts@zurich.ibm.com on 2011-11-30)
  65. Re: TPE Document S3 (from fielding@gbiv.com on 2011-10-31)
  66. Input for TPE Discussion: Issue cleanup (from mts@zurich.ibm.com on 2011-10-26)
  67. ISSUE-78: What is the difference between absence of DNT header and DNT = 0? (from sysbot+tracker@w3.org on 2011-09-22)

Related notes:

Proposed strawman text (2011-10-26) defines that a "0" may only be sent once a user expressed that he accepts tracking. From an absent header, a server can only derive that a user has NOT expressed a preference not to be tracked.

Matthias Schunter, 27 Oct 2011, 09:38:52

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Matthias Schunter <matthias.schunter@intel.com>, Chair, Bert Bos <bert@w3.org>, Staff Contact
Tracker: documentation, (configuration for this group), originally developed by Dean Jackson, is developed and maintained by the Systems Team <w3t-sys@w3.org>.
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