What's it?

Scraping is the process of using bots to extract content and data from a website.

Source: https://www.incapsula.com/web-application-security/web-scraping-attack.html

Scraper tools and bots

• Recognize unique HTML site structures
• Extract and transform content
• Store scraped data
• Extract data from APIs

Scraper libraries

• Mechanize (Nokogiri)
• Watir
• BeautifulSoup
• Cheerio

Scraper types

• Googlebot identifies itself in its HTTP header as belonging to Google(robot.txt)
• Malicious bots, create a false HTTP user agent

Web scraping protection

• HTML fingerprint
• IP reputation
• Progressive challenges(CAPTCHA)
• .htaccess

Server-side scraping

• Cheerio.js

• Phantomjs