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What Is a User Agent? A Complete Guide for 2025 - Browserless

Spoofing user agents carries both legal and ethical risks. Responsible use means maintaining consistency, transparency, and avoiding the impersonation of protected services. Introduction A user agent is a text string sent by your browser or script during an HTTP request to identify the client's software and operating environment to the server.

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https://en.wikipedia.org › wiki › User-Agent_header

User-Agent header - Wikipedia

The user agent string format is currently specified by section 10.1.5 of HTTP Semantics. The format of the user agent string in HTTP is a list of product tokens (keywords) with optional comments. For example, if a user's product were called WikiBrowser, their user agent string might be WikiBrowser/1.0 Gecko/1.0. The "most important" product component is listed first. The parts of this string ...

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https://deviceatlas.com › sites › default › files › files › DeviceAtlas_The_Complete_Guide_To_User-Agents_2025.pdf

PDF The complete guide to User-Agents - DeviceAtlas

What is a User-Agent string? A User-Agent (UA) string is a piece of text that devices send to web servers stating what kind of device and browser are being used. In simple terms, it acts as the messenger (agent) between the device and the web server. Websites use this information to show visitors the correct version of their site. It is a standard part of web architecture and is passed by all ...

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https://whatismyuseragent.com

What is my user agent

Your user agent is a string that web servers use to identify your browser and optimize content delivery. Learn what a user agent is, how to troubleshoot browser issues, and see your user agent details on this site.

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