I set my Preferred Domain for my website with www
in Google Webmaster Tools, then I added the following code to my .htaccess file:
RewriteEngine On
RewriteCond %{HTTP_HOST} ^example.com$
RewriteRule (.*) http://www.example.com/$1 [R=301,L]
Then I added the non-www
version of my website to Google Webmaster Tools, but all the charts went down to zero in that version. However, changing back to www
version, I saw a small decrease in impressions, etc...
My question is if that's normal for my website? If so, then what do I have to do with the non-www
version in my Google Webmaster Tools account that doesn't have any indexed pages, sitemaps, etc...?