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User-Agent header

In computing, the User-Agent header is an HTTP header intended to identify the user agent responsible for making a given HTTP request. Whereas the character sequence User-Agent comprises the name of the header itself, the header value that a given user agent uses to identify itself is colloquially known as its user agent string. The user agent for the operator of a computer used to access the Web has encoded within the rules that govern its behavior the knowledge of how to negotiate its half of a request-response transaction; the user agent thus plays the role of the client in a client–server system. Often considered useful in networks is the ability to identify and distinguish the software facilitating a network session. For this reason, the User-Agent HTTP header exists to identify the client software to the responding server.

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https://whatmyuseragent.com

What's My User Agent?

Find out your user agent string, browser, opera system, device and more with this tool. Learn what a user agent is and how it is used for feature detection and compatibility.

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https://developer.mozilla.org › en-US › docs › Web › HTTP › Reference › Headers › User-Agent

User-Agent header - HTTP | MDN - MDN Web Docs

The HTTP User-Agent request header is a characteristic string that lets servers and network peers identify the application, operating system, vendor, and/or version of the requesting user agent.

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https://chromewebstore.google.com › detail › user-agent-switcher-and-m › bhchdcejhohfmigjafbampogmaanbfkg

User-Agent Switcher and Manager - Chrome Web Store

The extension enables user-agent spoofing on specific domains only; it is conversely possible to exclude certain domains from spoofing. Check the Options page for more info. 5. You can set per-site user-agent strings 6. There is an option to randomize user-agent strings. 7.

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https://www.whatismybrowser.com › detect › what-is-my-user-agent

What is my User Agent? - WhatIsMyBrowser.com

Learn what your user agent is and what it reveals about your web browser, operating system, and mobile device. Find out how to change or fake your user agent and why some sites may detect it.

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https://en.wikipedia.org › wiki › User_agent

User agent - Wikipedia

On the Web, a user agent is a software agent responsible for retrieving and facilitating end-user interaction with Web content. [1] This includes all web browsers, such as Google Chrome and Safari, some email clients, standalone download managers like youtube-dl, and other command-line utilities like cURL.

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https://www.geeksforgeeks.org › html › http-headers-user-agent

HTTP Headers - User-Agent - GeeksforGeeks

The HTTP header User-Agent is a request header that sends a characteristic string to web servers, allowing them to identify the Operating System (OS) and browser of the client making the request. Every time your browser connects to a website, it includes the User-Agent field in the HTTP header.

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https://www.browserless.io › blog › what-is-a-user-agent

What Is a User Agent? A Complete Guide for 2025

Understand user agents, their role in bot detection, and how to customize them ethically for scraping and automation. Get tips and tools for testing in 2025.

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https://www.browserstack.com › guide › what-is-user-agent-header

Beginner's Guide to User-Agent HTTP Headers in Testing

Beginner's Guide to User-Agent HTTP Headers in Testing Learn what a User-Agent Header is, how it works, and how to test it effectively. Use Requestly to modify and test different User-Agent strings easily.

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https://www.huntress.com › cybersecurity-101 › topic › what-is-a-user-agent

What is a User Agent? - Huntress

Discover what a user agent is and how it facilitates web interactions. Learn about User-Agent strings and their role in web optimization.

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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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