A user agent parser is a software tool or script that analyzes the user agent string sent by a web browser to a web server during an HTTP request. The user agent string typically contains information about the browser, its version, the operating system, and sometimes additional details such as device type or rendering engine. User agent parsers extract and interpret this information to provide insights into the type of device and browser used by the client, which can be valuable for various purposes such as website optimization, analytics, and customized content delivery.
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