This error is occurring again today. YQL is incorrectly reporting robots.txt exclusion.
This query works:
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select * from html where url="http://www.example.com"
This query does not work:
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select * from html where url="http://subdomain.example.com"
There is no robots.txt on subdomain.example.com and the YQL console response is:
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error="Requesting a robots.txt restricted URL: http://subdomain.example.com/"