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Perl module P608
Robots, Crawlers and Spiders
Exercises, examples and other material relating to training module P608. This topic is presented on public courses Using Perl on the Web, Perl Extra
Although most users of the web will be seated at a browser and will call up pages one by one, there's also a requirement for automated browsing tools. For example, a search engine such as Google will methodically visit a site page by page, indexing the entire content for its customers, and a web site validation program will visit each page in turn in order to find any broken links before live users do. Perl is an excellent language for writing automated browsing tools such as these, and in this module we study the techniques you may wish to use, and also the etiquette involved in writing socially acceptable automata.
Background information
Some modules are available for download as a sample of our material or under an Open Training Notes License for free download from [here].
Topics covered in this module
Definitions.
Cautions. Checking a page, links and sites. Checking a single page. Checking links and included files. Checking a site. Things to do with a pet spider. Being considerate. The robots exclusion standard. Bandwidth. Complete learning
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