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

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

Oct 28, 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

Jun 25, 2024

It's a short, technical description of the web browser, operating system, (and maybe mobile device) that you're using as you access the internet.

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

User agent - Wikipedia

A user agent is a software agent responsible for retrieving and facilitating end-user interaction with Web content.

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

2025: List of User-Agent strings - DeviceAtlas

Tablet User Agents · 1; SHIELD Tablet K1 Build/MRA58K; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/55.0.2883.91 Safari/537.36 · 2; SAMSUNG SM- ...

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

User agent - Glossary - MDN Web Docs

Jul 11, 2025

Besides a browser, a user agent could be a bot scraping webpages, a download manager, or another app accessing the Web. Along with each request ...

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https://useragents.io

UserAgents.io: List of User Agents strings

UserAgents.io provides a simple way to parse a user agent and get technical information about it. The database is updated daily and easy to navigate. What ...

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https://whatmyuseragent.com

What's My User Agent?

It is used to identify the type of browser you are using, what device and operating system you are using, and the version of the browser you are using. This ...

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https://www.seobility.net › en › wiki › User_Agent

User Agent - Definition, Types, and Importance - Seobility Wiki

A user agent (short: UA) is software that communicates with servers in a network. An example would be a web browser that retrieves a web page from a server on ...

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https://www.heise-regioconcept.de › online-marketing-glossar › user-agent

Was ist ein User Agent? Definition & Anwendung - heise regioconcept

Jan 22, 2024

Der User-Agent-String ist ein Textabschnitt, der in HTTP-Anfragen enthalten ist und Informationen über die Software und das Endgerät des ...

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