Web Development Intermediate

What is WebSocket?

A communication protocol that enables full-duplex, real-time data exchange between a browser and server over a single connection.

WebSockets provide persistent, bidirectional communication between client and server. Unlike HTTP (request-response), WebSockets allow the server to push data to clients instantly without polling.

Use cases include chat applications, live dashboards, gaming, collaborative editing, and real-time notifications. The connection starts as an HTTP upgrade request, then switches to the WebSocket protocol (ws:// or wss://).

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Google's metrics for measuring user experience quality, including loading speed, interactivity, and visual stability of web pages.

HTTP Status Codes

Standardized three-digit codes returned by web servers to indicate the result of a client's HTTP request.

Progressive Web App (PWA)

A web application that uses modern web capabilities to deliver app-like experiences with offline support and push notifications.

A mechanism where a server sends real-time HTTP POST notifications to a specified URL when specific events occur.

WebAssembly (Wasm)

A binary instruction format that enables near-native performance execution of code in web browsers alongside JavaScript.

Content Negotiation

An HTTP mechanism where client and server agree on the best representation of a resource based on format, language, or encoding preferences.

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