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This question already has an answer here:

Is it a good idea to redirect http://www.example.com to http://example.com or keep both ?

marked as duplicate by dan Mar 9 '15 at 4:11

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It's a good idea to redirect example.com to www.example.com. Because you can't use a CNAME for example.com's DNS record, which greatly reduces your options for things like load balancing and resilience.

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