Textbook in PDF format

Learn by doing: code a Web server in Node.js
Introduction
Most people use HTTP daily, but few understand its inner workings. This “Build Your Own X” book dives deep, teaching basics from scratch for a clearer understanding of the tools and tech we rely on.
Network programming.
Protocols & communication.
HTTP in detail.
Contents
Part I: Make A Basic HTTP Server
Introduction
HTTP Overview
Code A TCP Server
Promises and Events
A Simple Network Protocol
HTTP Semantics and Syntax
Code A Basic HTTP Server
Part II: Applications & Extensions
Dynamic Content and Streaming
File IO & Resource Management
Range Requests
HTTP Caching
Compression & the Stream API
WebSocket & Concurrency