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We have many parameters in our URL and I wonder what will do the parameters pasted below. Will they disallow all the parameters after ?? Please tell me what does this mean:

Disallow: /?
Disallow: /*?*

What is the difference between them?

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Instance 1

Disallow: /?

This will disallow any URL's where ? follows a /.

For example:-

http://www.example.net/?
http://www.example.net/page/?
http://www.example.net/page/sub/?
http://www.example.net/page/sub/?89y398th03th

Instance 2

Disallow: */?

This will disallow any URL's where ? exists in the URL after a /:-

http://www.example.net/?
http://www.example.net/page/?
http://www.example.net/page/sub/?
http://www.example.net/page/sub/?89y398th03th
http://www.example.net/search?q=url
http://www.example.net/type?paramater=query

You would benefit from reading the robotstxt documentation where all of this is explained.

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    Disallow: /? will only disallow URLs in the root of the site (prefix matching). ie. example.net/?something, but not http://www.example.net/page/? (you would need a pattern like */? for that to work). (The * at the end of the pattern in /*?* is also superfluous.)
    – MrWhite
    Commented Apr 13, 2015 at 10:04

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