Google webmasters tool is showing me 26 duplicate pages because you can access the page in both ways: /crossMaker.php?jsonID=103 /crossMaker?jsonID=103
In my htaccess file i made it possible not to include the php extension but probably somewhere in the code i linked to the filename with the suffix so google crawled it.
What can i do so that google will forget about the file with the extension? use 301 redirect? if so how do i do that?