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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REST (Representational State Transfer)

An architectural style for designing networked applications using standard HTTP methods and stateless communication.

Progressive Web App (PWA)

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

A set of browser-native APIs for creating reusable, encapsulated custom HTML elements with their own styling and behavior.

Structured Data (Schema.org)

A standardized vocabulary for marking up web content so search engines can understand and display it as rich results.

The latest HTTP version that uses QUIC instead of TCP, providing faster connections and better performance on unreliable networks.

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Techniques for storing copies of web resources at various levels to reduce server load, bandwidth, and response times.

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