Programación

HTTP/2 replaced HTTP/1.1’s multiple TCP connections with a single connection multiplexed and compressed with HPACK. This guide explains how it works internally, how to configure it in Nginx and Node.js, and when it actually improves a site’s performance.

Server-Sent Events let a server push data to a browser over an HTTP connection that never closes. It’s simpler than WebSocket, comes with automatic reconnection built in, and it’s the same format used by language model streaming APIs.

WebSocket is the protocol that keeps a connection open between browser and server so both sides can send data at any time. This article explains the handshake, frame structure, and how to implement it step by step with Node.js.

The QUIC protocol runs over UDP and eliminates the slow handshake of separate TCP plus TLS negotiations, letting HTTP/3 open connections in a single round trip or even zero. This guide explains how it works internally, how to test it with curl and nginx, and when it makes sense over HTTP/2.

CORS is the policy that decides whether the browser hands over an API response to a script running on another domain. This guide explains the preflight mechanism, the exact headers you need, and the most common configuration mistakes.

GraphQL is a query language that lets the client request exactly the data it needs, without over-fetching or chaining multiple calls. This guide explains how it works internally, with code examples and an honest comparison with REST.