Forum Moderators: phranque
RewriteCond %{SERVER_PORT} ^443$
RewriteCond %{HTTP_USER_AGENT} ^Googlebot.*
RewriteRule .* http://%{SERVER_NAME}%{REQUEST_URI} [R,L]
Now you should look into the canonicalization issues that got you into this in the first place; Any requests for the non-canonical domain should 301-redirect to the canonical domain, and any requests for pages or sections of your site that are made using the wrong protocol by *any* client should be redirected to force use of the correct protocol. You will find these subjects already fairly well-covered here if you want to try a few searches.
Jim