Web Development Intermediate

What is CDN (Content Delivery Network)?

A distributed network of servers that delivers web content to users from the geographically closest location.

CDNs cache content (images, CSS, JavaScript, videos) at edge servers worldwide. When a user requests content, it is served from the nearest edge server instead of the origin server, reducing latency and load.

Benefits include faster page loads, reduced bandwidth costs, DDoS protection, and high availability. Popular CDNs include Cloudflare, AWS CloudFront, Akamai, and Fastly.

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

A query language for APIs that lets clients request exactly the data they need, reducing over-fetching and under-fetching.

A technique that delays loading non-critical resources until they are needed, improving initial page load performance.

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Techniques for loading custom fonts efficiently to minimize their impact on page load performance and visual stability.

A high-performance RPC framework using Protocol Buffers and HTTP/2 for efficient service-to-service communication.

An automatic OPTIONS request sent by browsers before certain cross-origin requests to check if the actual request is permitted.

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