Google announced experimental HTTPS support on Blogger (Blogspot) last September. An announcement from the company today says that the tests went well and so protocol comes as a default for all platform user blogs.
Back in September, the company had added a setting to its Blogger admin that allowed users to enable links security TTPS on their blogs.
This setting no longer exists as the feature applies by default to all blogs. In place of the removed setting there is a new option listed as “HTTPS redirect.”
This option, if enabled, will automatically redirect all blog visitors to HTTPS URL instead of HTTP links.
This redirection works automatically, and users who click on links that are posted on social networks or other pages will automatically be transferred to secure HTTPS connections without having to do anything.
In September, with the first tests, bugs were encountered on subdomain blogs, such as username.blogspot.com, and not on blogs that work with custom domains, such as userdomain.com.
The error was known as "mixed content" and according to Google some subdomains blogs are likely to encounter similar errors.
So he created a tool to help you identify them Mistakes of mixed content, and correct them websites you.