User Agent

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A user agent is a software agent that acts on behalf of the user. The user agent acts as a client in a network protocol.

Robot exclusion standard (robot.txt)

A site owner wishes to give instructions to a web robot will place a text file, robot.txt in root of the website. The file functions as a request that robots do not access certain pages, for example out of preference for privacy from search engine results, or avoidance of misleading categorization of a site. Search engines follow this standard.

robot.txt is not a useful means of security for restricting access from bots. Security by obscurity is not encouraged and not secure.