GitHub Pages has implemented official support for HTTPS on all <username>.github.io sites to enhance security and encourage widespread adoption of HTTPS across the internet. This update ensures traffic to GitHub Pages sites is encrypted, preventing unauthorized access and tampering. Users can now access these sites securely with HTTPS and enable HTTPS enforcement, which will automatically redirect HTTP requests to HTTPS. Starting June 15, 2016, HTTPS enforcement will be mandatory for all new GitHub Pages sites, and users with existing sites can enable this feature through their repository's settings. This move follows previous limitations where traffic from GitHub's CDN to its servers was not encrypted, which has now been resolved.