April 23, 2001
MotivationWeb site owners should be able to determine how many of their users are using ad-blocking software so that they can make informed policy decisions about allowing the use of ad blocking on their site.
ProposalAll ad-blocking software should modify the User-Agent field in the HTTP header of requests sent to a web server to indicate that ad-blocking software is active. The software should append:
to the User-Agent value supplied by the browser. This would allow web site operators to easily determine both the total number of ad-blocked pages and the number attributable to each software package.
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