Software Design

WebSocket Handshake and Keep-Alive Lifecycle

UML Sequence Diagrams · made in Skemio

Sequence diagram illustrating a client upgrading an HTTP request to a WebSocket connection via a proxy and server, followed by bidirectional frames and ping-pong keep-alive.

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What it shows

Client sends HTTP GET with Upgrade: websocket and Connection headers
Server replies with HTTP 101 Switching Protocols to establish socket
Lightweight ping/pong heartbeat frames detect broken TCP connections

The takeaway

WebSockets bootstrap over standard HTTP ports, then transition to raw TCP framing.

#WebSockets,#SystemDesign,#Backend,#Networking,#SoftwareArchitecture,#WebDev

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