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

What is my user agent? - WhatIsMyBrowser.com

Jun 25, 2024

The User Agent string is a HTTP Header that your web browser sends to each page it requests. Do you want to see all the headers your browser is ...

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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, vendor, and/or ...

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

2025: List of User-Agent strings | DeviceAtlas

Android User Agents. With the Client Hints support. Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) ...

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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.

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

User agent - Glossary - MDN Web Docs

Jul 11, 2025

A user agent is a computer program representing a person, for example, a browser in a Web context. Besides a browser, a user agent could be a bot scraping ...

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

What is My User Agent? - DNS Checker

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 ...

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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

Ein User Agent ist eine Softwareanwendung oder ein Programmcode, der auf einem Endgerät wie einem Computer oder einem Smartphone läuft und dazu ...

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https://www.w3.org › WAI › UA › work › wiki › Definition_of_User_Agent

Definition of User Agent - WAI UA Wiki - W3C

Jun 16, 2011

A user agent is any software that retrieves and presents Web content for end users or is implemented using Web technologies.

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