High Performance Browser Networking

A book from Ilya Grigorik, web performance engineer at Google:

Performance is a feature. This book provides a hands-on overview of what every web developer needs to know about the various types of networks (WiFi, 3G/4G), transport protocols (UDP, TCP, and TLS), application protocols (HTTP/1.1, HTTP/2), and APIs available in the browser (XHR, WebSocket, WebRTC, and more) to deliver the best - fast, reliable and resilient - user experience.

Available to read online at hpbn.co