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@scottjehl 8 years ago, I tried to redirect only bots to make sure they saw only one domain (I didn't know canonical yet 😅), so that users could get a fast response both with and without
www.
. I wrote about it (in French) and received a lot of negative comments: nicolas-hoizey.com/articles/2012/07/06/reconcilier-seo-et-webperf-au-niveau-des-redirections-de-sous-domaines/