How to Redirect http:// to https:// Using a Permanent 301
Making certain that when you redirect http to https is happening correctly is very important. It keeps your visitors safe by encrypting everything between your website and them.
It also makes certain that Google doesn't think that you have two pieces of content that are identical. If Google thinks you have duplicate content then at best it is going to pick whichever one it thinks is the correct one, at worst Google is going to penalize you.
Don't leave it up to chance, make sure that you are correctly redirecting from Http to Https!