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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.

  • Wikipedia

user agent

software acting on behalf of a user

  • Wikipedia (en)
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https://developer.mozilla.org › en-US › docs › Web › HTTP › Headers › User-Agent

User-Agent - HTTP - MDN Web Docs - Mozilla

Feb 24, 2025 — The HTTP User-Agent request header is a characteristic string that lets servers and network peers identify the application, operating system, ...

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

User-Agent - HTTP - MDN Web Docs - Mozilla

Learn what the User-Agent header is, how it identifies the browser, operating system, and other details of the requesting user agent, and how to parse it. See examples of different User-Agent strings for various browsers, crawlers, and tools.

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

User agent - Wikipedia

A user agent is a software agent that retrieves and facilitates web content for end-users. Learn about different types of user agents, such as browsers, email clients, and command-line utilities, and how they are identified by the HTTP User-Agent header.

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https://chromewebstore.google.com › detail › user-agent-switcher-for-c › djflhoibgkdhkhhcedjiklpkjnoahfmg

User-Agent Switcher for Chrome - Chrome Web Store

With this extension, you can quickly and easily switch between user-agent strings. Also, you can set up specific URLs that you want to spoof every time.

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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://www.reddit.com › r › firefox › comments › 1729yqx › what_does_useragent_really_do

r/firefox on Reddit: What does user-agent really do?

It's historically used as a signal to which browser you're using or what bot you are. Some sites (looking at you Google) use it or some other ...

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https://developer.mozilla.org › en-US › docs › Glossary › User_agent

User agent - MDN Web Docs Glossary: Definitions of Web-related terms | MDN

Learn what a user agent is, how it identifies itself with a user agent string, and how it can be spoofed. A user agent can be a browser, a bot, or another app accessing the Web.

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https://useragentstring.com

UserAgentString.com - Chrome version 84.0.4147.105

Understand what information is contained in a Chrome user agent string. Get an analysis of your or any other user agent string. Find lists of user agent strings from browsers, crawlers, spiders, bots, validators and others..

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https://deviceatlas.com › blog › list-of-user-agent-strings

List of User Agent strings - DeviceAtlas

4 days ago - The User-Agent (UA) string is contained in the HTTP headers and is intended to identify devices requesting online content. The User-Agent tells the server what the visiting device is (among many other things) and this information can be used to determine what content to return.

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https://whatsmyua.info

What's my user agent?

What's my user agent? See what your user-agent detection library really thinks! Enter a user-agent string: Mozilla/5.0 (Linux; Android 6.0.1; Nexus 5X ...

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

HTTP Headers - User-Agent - GeeksforGeeks

Learn what the User-Agent header is, how it identifies the browser and OS of the client, and why it matters for web browsing. See examples of User-Agent strings for common browsers and devices.

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https://explore.whatismybrowser.com › useragents › parse

Parse a user agent - WhatIsMyBrowser.com

Learn how to decode and understand any user agent string sent by your web browser or other software. Use this tool to parse user agents by browser, OS, platform, hardware, software type and layout engine.

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https://developer.mozilla.org › en-US › docs › Web › HTTP › Guides › Browser_detection_using_the_user_agent

Browser detection using the user agent string (UA sniffing)

Learn why feature detection is better than browser detection and how to use it with modern APIs and CSS. Avoid the pitfalls of parsing the user agent string (UA sniffing) and the alternatives to UA sniffing.

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https://webbrowsertools.com › useragent

What is my User Agent? - WebBrowserTools.com

User agents are the strings of text which specify the browser and operating system of web servers. User agents are present in HTTP headers when the browser wants to communicate with a server. Each browser has its specific user agent string and web servers utilize this information to deliver appropriate material across different operating systems.

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

User-Agent Switcher and Manager - Chrome Web Store

Spoof websites trying to gather information about your web navigation to deliver distinct content you may not want

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https://developers.google.com › search › docs › crawling-indexing › overview-google-crawlers

Overview of Google crawlers and fetchers (user agents)

Google crawlers discover and scan websites. This overview will help you understand the common Google crawlers including the Googlebot user agent.

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https://whatismyipaddress.com › user-agent

What is User Agent: Understanding Web Browsers - WhatIsMyIPAddress

User agent is a term for the Web browser or application that connects to a website or service through the Internet. Learn how user agent works, what information it sends to the server, and how some browsers used to spoof other browsers in the past.

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https://www.link-assistant.com › seo-wiki › user-agent

User Agent: Definition and Examples. Most Common User Agents List.

A user agent is a string of text that is sent by a web browser to a web server to identify itself and provide information about the browser's capabilities.

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https://privacysandbox.google.com › protections › user-agent

What is User-Agent reduction? | Privacy Sandbox

User-Agent reduction limits passively shared browser data to reduce the volume of sensitive information which leads to fingerprinting. The reduction is now complete.

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https://brave.com › glossary › user-agent

User Agent Meaning & Definition | Brave

Online privacy can be confusing. In this easy-to-read list, you'll find short definitions of essential privacy and Internet terms including User Agent. Check out the Brave Privacy Glossary here.

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https://51degrees.com › developers › user-agent-tester

My User-Agent tester | 51Degrees

This tool can parse HTTP headers (such as the User-Agent and User-Agent Client Hints) to provide information on the associated device, operating system, and browser.

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

User-Agent header - Wikipedia

This is the latest accepted revision, reviewed on 12 February 2025. 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 ...

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https://www.w3.org › WAI › standards-guidelines › uaag

User Agent Accessibility Guidelines (UAAG) Overview | Web Accessibility Initiative (WAI) | W3C

Accessibility resources free online from the international standards organization: W3C Web Accessibility Initiative (WAI).

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https://deviceatlas.com › sites › deviceatlas.com › files › files › DeviceAtlas_The_Complete_Guide_To_User-Agents_2023.pdf

The complete guide to User-Agents

DeviceAtlas identifies and verifies connected devices in real time for rich, actionable intelligence across every customer touchpoint.

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https://stackoverflow.com › questions › 788036 › what-is-a-user-agent

What is a user agent?

This site did not provide any description.

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https://dnschecker.org › user-agent-info.php

User-Agent Information - Instantly Check Browser User-Agent

User-agent checker instantly tells your browsers user agent. User-agent is the identifier which lets the server know what browser is requesting the resource or what operating system the request initiator uses.

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

What is a user agent? - WhatIsMyBrowser.com

Wondering what a user agent is? Do I have a user agent? We've got a guide to explain it all to you in simple terms.

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