I have url : http://www.website.com/shopping/books/?b=9
/?b=9 from robots.txt
User-agent: * Disallow: /?b=9
But when i test this from Google Webmaster, on Robots.txt Test Tools, it Shows this page allowed while it should not...
Please tell any wrong with my robots.txt
/?b=9 this will be same in all cases and
/shopping/books/ will be change with different category.
How to Block this types of string ?
Is it correct ?