From HTTP and WebSockets to gRPC and SMTP — concise, RFC-anchored explanations of the protocols that carry the web.
Binary framing, multiplexed streams, HPACK header compression, server push.
UDP-based transport, 0-RTT, connection migration, no head-of-line blocking.
SSL 3.0 through TLS 1.3 — what changed, what's deprecated, what to deploy.
Full-duplex framing over a single TCP connection. Handshake, frames, lifecycle.
Peer-to-peer media and data channels — ICE, STUN, TURN, SDP.
HTTP/2-based RPC with Protocol Buffers. Unary, server, client, and bidi streaming.
How mail moves between servers — verbs, codes, relays, and SPF/DKIM/DMARC pointers.
Classic FTP, FTPS, and SFTP. Why SFTP isn't FTP and what to use today.