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Having the tag in a url that points to itself?
Would this work?
Ask hosting,all people have is these days htaccess for mod_rewrite.
have sites where we use the canonical tag on every page, even though there is no apparent duplicate problem with the URL configuration.
First choice would be an ISAPI 301 redirect from /index.php to / and second choice would be the canonical tag to say that "/" is the correct URL.