Pt. I. HTTP: The Web's Foundation. 1. Overview of HTTP. 2. URLs and Resources. 3. HTTP Messages. 4. Connection Management -- Pt. II. HTTP Architecture. 5. Web Servers. 6. Proxies. 7. Caching. 8. Integration Points: Gateways, Tunnels, and Relays. 9. Web Robots. 10. HTTP-NG -- Pt. III. Identification, Authorization, and Security. 11. Client Identification and Cookies. 12. Basic Authentication. 13. Digest Authentication. 14. Secure HTTP -- Pt. IV. Entities, Encodings, and Internationalization. 15. Entities and Encodings. 16. Internationalization. 17. Content Negotiation and Transcoding -- Pt. V. Content Publishing and Distribution. 18. Web Hosting. 19. Publishing Systems. 20. Redirection and Load Balancing. 21. Logging and Usage Tracking -- Pt. VI. Appendixes -- App. A. URI Schemes -- App. B. HTTP Status Codes -- App. C. HTTP Header Reference -- App. D. MIME Types -- App. E. Base-64 Encoding -- App. F. Digest Authentication -- App. G. Language Tags -- App. H. MIME Charset Registry.