From last one year, Google has started this initiative to promote HTTPS which is a must for securing all your content and encrypting all the content written by BlogSpot writers or authors from getting copied by other networks or viewers. But it has an error of mixed content which Google is trying to fix but yet many times it has to be done by blog writer or author himself.

As part of this launch, we’re removing the HTTPS Availability setting. Even if you did not previously turn on this setting, your blogs will have an HTTPS version enabled.
They have come up with the new setting called HTTPS Redirect that allows you to opt-in to redirect HTTP requests to HTTPS. Thus when a writer enables HTTPS for BlogSpot the viewers are automatically redirected to HTTPS version even when they click on HTTP version. If a writer wants to turn off this setting, then visitors will have two options for viewing your blog: the unencrypted version at http://<your-blog>.blogspot.com or the encrypted version at https://<your-blog>.blogspot.com.

An advice to all writers that if you are facing mixed content error and Google itself repairs it all your links and hyperlinks will not be affected thus helping a safe and pleasant experience. Enjoy your day and don’t forget to comment your views about the article.