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Table of Contents

Preface

1. Introduction
Why Write Your Own Clients?
The Web and HTTP The Programming Interface
A Word of Caution

2. Demystifying the Browser
Behind the Scenes of a Simple Document
Retrieving a Document Manually
Behind the Scenes of an HTML Form
Behind the Scenes of Publishing a Document
Structure of HTTP Transactions

3. Learning HTTP
Structure of an HTTP Transaction
Client Request Methods
Versions of HTTP
Server Response Codes
HTTP Headers

4. The Socket Library
A Typical Conversation over Sockets
Using the Socket Calls
Server Socket Calls
Client Connection Code
Your First Web Client
Parsing a URL
Hypertext UNIX cat
Shell Hypertext cat
Grep out URL References
Client Design Considerations

5. The LWP Library
Some Simple Examples
Listing of LWP Modules Using LWP

6. Example LWP Programs
Simple Clients
Periodic Clients
Recursive Clients

7. Graphical Examples with Perl/Tk
A Brief Introduction to Tk
A Dictionary Client: xword
Check on Package Delivery: Track
Check if Servers Are up: webping

A. HTTP Headers
General Headers
Client Request Headers
Server Response Headers
Entity Headers
Summary of Support Across HTTP Versions

B. Reference Tables
Media Types
Character Encoding
Languages
Character Sets

C. The Robot Exclusion Standard

Index