View Larger Image	Duane Wessels O'Reilly Media, Paperback, Published June 2001, 300 pages, ISBN 156592536X
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On the World Wide Web, speed and efficiency are vital. Users have little patience for slow web pages, while network administrators want to make the most of their available bandwidth. A properly designed web cache reduces network traffic and improves access times to popular web sites--a boon to network administrators and web users alike.

Web Caching hands you all the technical information you need to design, deploy, and operate an effective web caching service. It starts with the basics of how web caching works, from the HTTP headers that govern cachability to cache validation and replacement algorithms.

Topics covered in this book include:

• Designing an effective cache solution
• Configuring web browsers to use a cache
• Setting up a collection of caches that can talk to each other
• Configuring an interception cache or proxy
• Monitoring and fine-tuning the performance of a cache
• Configuring web servers to cooperate with web caches
• Benchmarking cache products

  The book also covers the important political aspects of web caching, including privacy, intellectual property, and security issues.

  Internet service providers, large corporations, or educational institutions--in short, any network that provides connectivity to a wide variety of users--can reap enormous benefit from running a well-tuned web caching service. Web Caching shows you how to do it right.

Table of Contents

Preface

Chapter 1. Introduction

    Web Architecture

    Web Transport Protocols

    Why Cache the Web?

    Why Not Cache the Web?

    Types of Web Caches

    Caching Proxy Features

    Meshes, Clusters, and Hierarchies

    Products

Chapter 2. How Web Caching Works

    HTTP Requests

    Is It Cachable?

    Hits, Misses, and Freshness

    Hit Ratios

    Validation

    Forcing a Cache to Refresh

    Cache Replacement

Chapter 3. Politics of Web Caching

    Privacy

    Request Blocking

    Copyright

    Offensive Content

    Dynamic Web Pages

    Content Integrity

    Cache Busting and Server Busting

    Advertising

    Trust

    Effects of Proxies

Chapter 4. Configuring Cache Clients

    Proxy Addresses

    Manual Proxy Configuration

    Proxy Auto-Configuration Script

    Web Proxy Auto-Discovery

    Other Configuration Options

    The Bottom Line

Chapter 5. Interception Proxying and Caching

    Overview

    The IP Layer: Routing

    The TCP Layer: Ports and Delivery

    The Application Layer: HTTP

    Debugging Interception

    Issues

    To Intercept or Not To Intercept

Chapter 6. Configuring Servers to Work with Caches

    Important HTTP Headers

    Being Cache-Friendly

    Being Cache-Unfriendly

    Other Issues for Content Providers

Chapter 7. Cache Hierarchies

    How Hierarchies Work

    Why Join a Hierarchy?

    Why Not Join a Hierarchy?

    Optimizing Hierarchies

Chapter 8. Intercache Protocols

    ICP

    CARP

    HTCP

    Cache Digests

    Which Protocol to Use

Chapter 9. Cache Clusters

    The Hot Spare

    Throughput and Load Sharing

    Bandwidth

Chapter 10. Design Considerations for Caching Services

    Appliance or Software Solution

    Disk Space

    Memory

    Network Interfaces

    Operating Systems

    High Availability

    Intercepting Traffic

    Load Sharing

    Location

    Using a Hierarchy

Chapter 11. Monitoring the Health of Your Caches

    What to Monitor?

    Monitoring Tools

Chapter 12. Benchmarking Proxy Caches

    Metrics

    Performance Bottlenecks

    Benchmarking Tools

    Benchmarking Gotchas

    How to Benchmark a Proxy Cache

    Sample Benchmark Results

Appendix A. Analysis of Production Cache Trace Data

Appendix B. Internet Cache Protocol

Appendix C. Cache Array Routing Protocol

Appendix D. Hypertext Caching Protocol

Appendix E. Cache Digests

Appendix F. HTTP Status Codes

Appendix G. U.S.C. 17 Sec. 512. Limitations on Liability Relating to 
Material Online

Appendix H. List of Acronyms

Glossary

Index

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