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Google Webmasters Tools has notified me about too many duplicated URLs. Some parameters have been added that I don't know about and I need to remove it, for example:

http://example.com/5454/my-utr.html
http://example.com/5454/my_url.html?collcc=3067605522&

And this is marked as a duplicate URL on Google. How can I block ?=collcc or remove it with .htaccess. Or preferably remove just ?collcc= and redirect to the normal URL with .htaccess?

I know I can block in robots.txt file but I need clean URL still indexed on Google so I need to remove just the query collcc.

I have tried:

RewriteCond %{QUERY_STRING} collcc=
RewriteRule (.*) http://my-site.com/$1? [R=301,L]
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RewriteCond %{QUERY_STRING} collcc=
RewriteRule (.*) http://example.com/$1? [R=301,L]

This should already have "worked". It should have removed any query string, providing "collcc=" was found anywhere in the requested URL's query string.

This is assuming you aren't getting any "errors" and mod_rewrite is already enabled, with the appropriate directives. For example:

Options +FollowSymLinks
RewriteEngine On

The other possibility is that your directives are located in the wrong place in your .htaccess file which is resulting in a conflict with existing directives. This redirect will need to go near the top of your .htaccess file, before any existing rewrites.

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