Perl & LWP : Fetching Web Pages, Parsing Html, Writing Spiders & More - Sean M. Burke

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Perl & LWP

Fetching Web Pages, Parsing Html, Writing Spiders & More

By: Sean M. Burke

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Paperback | 2 July 2002

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245 Pages

Dimensions(cm)
20 x 178 x 234

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This volume on Perl and LWP covers topics including: understanding LWP and its design; fetching and analyzing URLs; extracting information from HTML using regular expressions and tokens; working with the structure of HTML documents using trees; setting and inspecting HTTP headers and response codes; managing cookies; accessing information that requires authentication; extracting links; cooperating with proxy caches; and writing Web spiders (also known as robots) in a safe fashion. It also includes many step-by-step examples that show how to apply the various techniques. Programs to extract information from Websites such as BBC News, Altavista, ABEBooks.com, and the Weather Underground, are explained in detail. The guide shows how to make Web requests, submit forms, and even provide authentication information, and it demonstrates using regular expressions, tokens, and trees to parse HTML.

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You Can Find This Book In

Non-Fiction Computing & I.T.Computer Programming & Software Development Web Programming Programming & Scripting Languages Digital Lifestyle & Online World: Consumer & User Guides Internet Guides & Online Services Graphical & Digital Media Applications Web Graphics & Design Booktopia Publisher Services John Wiley & Sons Publishers UK

Foreword	p. ix
Preface	p. xi
Introduction to Web Automation	p. 1
The Web as Data Source	p. 1
History of LWP	p. 3
Installing LWP	p. 4
Words of Caution	p. 9
LWP in Action	p. 10
Web Basics	p. 15
URLs	p. 15
An HTTP Transaction	p. 17
LWP::Simple	p. 19
Fetching Documents Without LWP::Simple	p. 24
Example: AltaVista	p. 25
Http Post	p. 27
Example: Babelfish	p. 28
The LWP Class Model	p. 31
The Basic Classes	p. 31
Programming with LWP Classes	p. 32
Inside the do_GET and do_POST Functions	p. 33
User Agents	p. 34
HTTP::Response Objects	p. 42
LWP Classes: Behind the Scenes	p. 47
URLs	p. 48
Parsing URLs	p. 48
Relative URLs	p. 54
Converting Absolute URLs to Relative	p. 55
Converting Relative URLs to Absolute	p. 57
Forms	p. 58
Elements of an HTML Form	p. 59
LWP and GET Requests	p. 59
Automating Form Analysis	p. 62
Idiosyncrasies of HTML Forms	p. 64
POST Example: License Plates	p. 70
POST Example: ABEBooks.com	p. 74
File Uploads	p. 81
Limits on Forms	p. 84
Simple HTML Processing with Regular Expressions	p. 85
Automating Data Extraction	p. 85
Regular Expression Techniques	p. 87
Troubleshooting	p. 91
When Regular Expressions Aren't Enough	p. 93
Example: Extracting Links from a Bookmark File	p. 93
Example: Extracting Links from Arbitrary HTML	p. 96
Example: Extracting Temperatures from Weather Underground	p. 98
HTML Processing with Tokens	p. 100
HTML as Tokens	p. 100
Basic HTML::TokeParser Use	p. 101
Individual Tokens	p. 105
Token Sequences	p. 107
More HTML::TokeParser Methods	p. 112
Using Extracted Text	p. 117
Tokenizing Walkthrough	p. 119
The Problem	p. 119
Getting the Data	p. 120
Inspecting the HTML	p. 121
First Code	p. 122
Narrowing In	p. 123
Rewrite for Features	p. 125
Alternatives	p. 131
HTML Processing with Trees	p. 132
Introduction to Trees	p. 132
HTML::TreeBuilder	p. 133
Processing	p. 137
Example: BBC News	p. 142
Example: Fresh Air	p. 145
Modifying HTML with Trees	p. 148
Changing Attributes	p. 148
Deleting Images	p. 152
Detaching and Reattaching	p. 153
Attaching in Another Tree	p. 156
Creating New Elements	p. 161
Cookies, Authentication, and Advanced Requests	p. 165
Cookies	p. 165
Adding Extra Request Header Lines	p. 169
Authentication	p. 172
An HTTP Authentication Example: The Unicode Mailing Archive	p. 175
Spiders	p. 178
Types of Web-Querying Programs	p. 178
A User Agent for Robots	p. 180
Example: A Link-Checking Spider	p. 181
Ideas for Further Expansion	p. 197
LWP Modules	p. 199
HTTP Status Codes	p. 203
Common MIME Types	p. 205
Language Tags	p. 207
Common Content Encodings	p. 209
ASCII Table	p. 211
User's View of Object-Oriented Modules	p. 224
Index	p. 235
Table of Contents provided by Syndetics. All Rights Reserved.

Perl & LWP

Fetching Web Pages, Parsing Html, Writing Spiders & More

At a Glance

Paperback

Shipping

How to return your order

Defective items

You Can Find This Book In

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