![]() Static and dynamic web pages can be retrieved by posting HTTP requests to the remote web server using socket programming. Sometimes even the best web-scraping technology cannot replace a human's manual examination and copy-and-paste, and sometimes this may be the only workable solution when the websites for scraping explicitly set up barriers to prevent machine automation.Ī simple yet powerful approach to extract information from web pages can be based on the UNIX grep command or regular expression-matching facilities of programming languages (for instance Perl or Python). The simplest form of web scraping is manually copying and pasting data from a web page into a text file or spreadsheet. It is a field with active developments sharing a common goal with the semantic web vision, an ambitious initiative that still requires breakthroughs in text processing, semantic understanding, artificial intelligence and human-computer interactions. Web scraping is the process of automatically mining data or collecting information from the World Wide Web. Since then, many websites offer web APIs for people to access their public database. An API ( Application Programming Interface) is an interface that makes it much easier to develop a program by providing the building blocks. In 2000, Salesforce and eBay launched their own API, with which programmers could access and download some of the data available to the public.
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