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Chapter 20. Web Automation

The web, then, or the pattern, a web at once sensuous and logical, an elegant and pregnant texture: that is style, that is the foundation of the art of literature.

—Robert Louis Stevenson, On some Technical Elements of Style in Literature (1885)

      Recipe 20.1.  Fetching a URL from a Perl Script
      Recipe 20.2.  Automating Form Submission
      Recipe 20.3.  Extracting URLs
      Recipe 20.4.  Converting ASCII to HTML
      Recipe 20.5.  Converting HTML to ASCII
      Recipe 20.6.  Extracting or Removing HTML Tags
      Recipe 20.7.  Finding Stale Links
      Recipe 20.8.  Finding Fresh Links
      Recipe 20.9.  Using Templates to Generate HTML
      Recipe 20.10.  Mirroring Web Pages
      Recipe 20.11.  Creating a Robot
      Recipe 20.12.  Parsing a Web Server Log File
      Recipe 20.13.  Processing Server Logs
      Recipe 20.14.  Using Cookies
      Recipe 20.15.  Fetching Password-Protected Pages
      Recipe 20.16.  Fetching https:// Web Pages
      Recipe 20.17.  Resuming an HTTP GET
      Recipe 20.18.  Parsing HTML
      Recipe 20.19.  Extracting Table Data
      Recipe 20.20.  Program: htmlsub
      Recipe 20.21.  Program: hrefsub
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