What they are, how to read them, and how to use them.

A User-Agent (UA) is an alphanumeric string that identifies the ‘agent’ or program making a request to a web server for an asset such as a document, image or web page. It is a standard part of web architecture and is passed by all web requests in the HTTP headers. 

This guide explains in detail the function of user-agents and how you can understand and leverage the information they offer.

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