If you don't redirect http://mywebsite.com to http://www.mywebsite.com, you may find yourself penalised for duplication by google.
Some nasty competitors may think that it is a good idea to point to the first URL, just to get you penalised.
An other thing to watch out is %20 in your urls. Let say that I am pointing to "http:// www.yoursite.com", the page http://%20www.yoursite.com will be crawled by search engines.
They may then think that it is a duplicate of http://www.yoursite.com.
to avoid this situation, you need to do a bit of url rewriting...eerr.. "I have tried but it doesn't work". that's right, url rewriting is in this case not the solution. what to do?
If you are running an apache server, solution is simple: activated mod_security.c
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