[tor-bugs] #628 [TorBrowserButton]: Language cloaking doesn't hide character set

Tor Bug Tracker & Wiki blackhole at torproject.org
Thu Jan 23 04:30:53 UTC 2014


#628: Language cloaking doesn't hide character set
-------------------------------+-------------------------------------------
     Reporter:  sjmurdoch      |      Owner:
         Type:  defect         |     Status:  new
     Priority:  major          |  Milestone:  TorBrowserBundle 2.3.x-stable
    Component:                 |    Version:
  TorBrowserButton             |   Keywords:  tbb-fingerprinting, interview
   Resolution:  None           |  Parent ID:
Actual Points:                 |
       Points:                 |
-------------------------------+-------------------------------------------

Comment (by dcf):

 It seems that Accept-Charset was disabled in Firefox 10 (and IE 8, and
 Safari 5, and Opera 11).

 https://developer.mozilla.org/en-US/docs/HTTP/Content_negotiation
 #The_Accept-Charset.3A_header:
 > Considering that:
 >  * UTF-8 is now well-supported by all relevant user-agents,
 >  * the presence of the header increases the  configuration-based entropy
 exposed,
 >  * the presence of the header increases the data transmitted for each
 request
 >  * almost no sites are using the value of this header for choosing
 content during the negotiation,
 > browsers started to stop sending this header in each request, starting
 with Internet Explorer 8, Safari 5, Opera 11 and Firefox 10. In the
 absence of Accept-Charset:, servers can simply assume that UTF-8 and the
 most common characters sets are understood by the client.

 [https://bugzilla.mozilla.org/show_bug.cgi?id=572652 Mozilla bug 572652],
 "Remove the Accept-Charset header from HTTP requests," is VERIFIED FIXED.

 http://wtfismyip.com/headers shows no Accept-Charset.

 It appears to me that this bug is obsolete.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/628#comment:11>
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