www.yourdomain.com vs. yourdomain.com
Most likely "www.yourdomain.com" and "yourdomain.com" take you to exactly the same place. That's because (again, most likely) your Apache or IIS configuration is set to do just that. In Apache, it might look something like this:
<VirtualHost 18.104.22.168:80> ServerName yourdomain.com:80 ServerAlias www.yourdomain.com ..
Unfortunately, that can cause unexpected problems for you from search engines and ranking sites that are too lazy to notice that these really are the same site.
For example, Netcraft has a nice little anti-phishing toolbar that also happens to show relative site popularity. I'd been running that toolbar for about a month when I noticed something I thought was odd: the Netcraft ranking for my main site had suddenly dropped by 33%. How could that be? A minute ago I was in the 16,000 neighborhood and suddenly I was near 20,000 instead.
The answer was simple: I had gone to "www.aplawrence.com" rather than my usual lazy "aplawrence.com". Netcraft saw those as different sites, and ranked them differently.
Solving that was easy enough: I moved the "ServerAlias www.aplawrence.com" to the pcunix.com website, which does a 301 Redirect to aplawrence.com. Restarting Apache now redirects any "www" access to the unadorned site. Netcraft may still have statistics on the "www" site, but those will fade away over time and all access will be properly credited to one site.
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