Glossary term
What is SNI (Server Name Indication)?
SNI stands for Server Name Indication.
The hostname the client writes (in plain text) in its first TLS message so one IP can serve many certificates.
Learn it properly · Networking for DevelopersLesson 5: TLS and Certificates: How HTTPS Really WorksThe handshake in plain words, certificates and chains, Let's Encrypt, mTLS, and the errors you will meet.