The reasons for our movePrivacyBy using HTTPS, internet service providers (ISPs) are not able to track the pages our readers are accessing. For the reasons mentioned above Google has announced that it will favour https content. Content authoring and integrityBy switching to HTTPS, browsers will ensure that the content displayed is actually published by the Guardian. Without HTTPS someone between the browser and our website could maliciously display other content or alter our content. HSTS headerThe HTTP Strict-Transport-Security response header lets a web site inform the browser that it should never load the site using HTTP and should automatically convert all attempts to access the site using HTTP to HTTPS requests instead.

Source: The Guardian November 29, 2016 12:22 UTC