User agents and referrers - who are you any way?
July 16, 2007 — Tim NashWe rely on knowing who is coming to our site and how they got their our conversion goals are set by this and sometimes our authentication systems rely on them but what are these concepts and how can we abuse use them.
User Agents
A user agent is the client application used with a particular network protocol; the phrase is most commonly used in reference to those which access the World Wide Web. Web user agents range from web browsers to search engine crawlers (”spiders”), as well as mobile phones, screen readers and braille browsers used by people with disabilities. When Internet users visit a web site, a text string is generally sent to identify the user agent to the server. This forms part of the HTTP request, prefixed with User-agent: or User-Agent: and typically includes information such as the application name, version, host operating system, and language. Bots, such as web crawlers, often also include a URL and/or e-mail address so that the webmaster can contact the operator of the bot.


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