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Free and open-source software portal; This is a category of articles relating to web crawlers which can be freely used, copied, studied, modified, and redistributed by everyone that obtains a copy: "free software" or "open source software".
A Web crawler starts with a list of URLs to visit. Those first URLs are called the seeds.As the crawler visits these URLs, by communicating with web servers that respond to those URLs, it identifies all the hyperlinks in the retrieved web pages and adds them to the list of URLs to visit, called the crawl frontier.
Free >1 billion [1] Unknown Yes Yes Google Search: Larry Page, Sergey Brin & Scott Hassan: Alphabet Inc. 1998 Proprietary: hundreds of billions [2] 9.022 billion [3] Yes Yes Kiddle: 2014 Proprietary: KidRex: 2008 Proprietary: KidzSearch: 2005 Proprietary: Lycos: 1995 Proprietary: Microsoft Bing: Microsoft: 1998/2009 Proprietary: Unknown Un ...
It is also possible to list multiple robots with their own rules. The actual robot string is defined by the crawler. A few robot operators, such as Google, support several user-agent strings that allow the operator to deny access to a subset of their services by using specific user-agent strings. [17] Example demonstrating multiple user-agents:
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