If you are on a restricted work computer where you cannot download software, a web proxy is ideal. If you are on your personal laptop or phone, a VPN app offers the most robust protection.

If you need a practical guide rather than a technical paper (e.g., "the 5 best website unblockers that work right now"), let me know and I can provide a list with current URLs and test results.

Server Name Indication (SNI) is part of the TLS handshake that happens when you connect to an HTTPS website. Even with encryption, the SNI field reveals which website you're trying to reach. Modern firewalls examine SNI fields and block connections to restricted domains. Advanced unblockers use "SNI spoofing" or "domain fronting" to disguise the true destination.