The rollout of HTTPS only (see previous Signpost coverage, blog post) has now been completed across all Wikimedia wikis. The HTTPS link is now marked as the canonical version through a <link rel="canonical" ..>
tag on each page. For example, the Main Page has a <link rel="canonical" href="https://en.wikipedia.orgview_html.php?sq=Envato&lang=en&q=Main_Page" />
tag. This instructs search engines to use the HTTPS version of the page. In addition, the servers are sending a HSTS header which tells the browser to only visit the website over HTTPS. Currently the expiry for the header is set to 3 days, and it is planned to increase it over time. More details are available on Meta-Wiki.