Web crawler strategies for web pages under robot.txt restriction
It provides introductory information for those curious about search engine mechanics, but is incremental as it covers well-established concepts without new findings.
This paper explains how search engines use web crawlers to index web pages and discusses the robot.txt protocol that webmasters use to restrict crawler access, addressing basic questions about search engine ranking and database population.
In the present time, all know about World Wide Web and work over the Internet daily. In this paper, we introduce the search engines working for keywords that are entered by users to find something. The search engine uses different search algorithms for convenient results for providing to the net surfer. Net surfers go with the top search results but how did the results of web pages get higher ranks over search engines? how the search engine got that all the web pages in the database? This paper gives the answers to all these kinds of basic questions. Web crawlers working for search engines and robot exclusion protocol rules for web crawlers are also addressed in this research paper. Webmaster uses different restriction facts in robot.txt file to instruct web crawler, some basic formats of robot.txt are also mentioned in this paper.