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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://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.

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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://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://whatmyuseragent.com

What's My User Agent?

A user agent is a small piece of data sent by your web browser when accessing a website or application. It identifies the type of browser, device, operating ...

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

What Is a User Agent? A Complete Guide for 2026

Jan 10, 2026

A user agent is a small piece of text sent by web browsers or automation scripts in HTTP requests to identify the client's software, browser ...

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https://user-agents.net

User Agents

The User-Agents.Net website provides various user agent lists and technical information about them.

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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://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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