Have already seen suggests on how to rewrite https to http. currently using this technique :

RewriteCond %{SERVER_PORT} ^443$
RewriteRule ^(.*)$ http://www.mysite.com/$1 [L,R=301]
RewriteRule ^(.*)$ http ://%{HTTP_HOST}%{REQUEST_URI} [R=301,L] 

Problem : I am currently on hostgator VPS and have found Google indexing my HTTPS pages. Weird for me as never bought an SSL. My site is a blog only. When spoke to Google forums, ( https://productforums.google.com/forum/#!msg/webmasters/2Hz46t44nwk/7voZWudFtAQJ ), they say I should redirect https to http. Now when I have redirected this using the above method, I am still getting SSL warning in browsers. And found that Google is still indexing my new pages with https.

I feel as I do not have an SSL, adding a redirect in https doesn't work. So if Google indexes my https page, then I should go and buy SSL, and tell there to redirect https to http. Why would I do that? Please help me, reduced the traffic by nearly 30% because of this.

Have even told search engines to go to this file (disallows everything) if they are on https.

Options +FollowSymlinks 
RewriteCond %{SERVER_PORT} ^443$ 
RewriteRule ^robots.txt$ robots_ssl.txt