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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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Response time: 0.8 seconds

brave	Suspended: too many requests
duckduckgo	Suspended: access denied
wikidata	0.8
startpage	0.7
google	0.4
wikipedia	0.1

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

User agent - Wikipédia

Un user agent ou agent utilisateur est une application logicielle cliente qui utilise un protocole réseau particulier ; l'expression est principalement employée ...

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

User-Agent header - HTTP - MDN - Mozilla

2025-07-04 00:00:00

4 juil. 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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http://useragent.fr

Analyse du User Agent - User Agent

Un user agent est un identifiant qui permet à un « agent » de s'identifier sur le web et de donner des informations sur lui-même.

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https://www.useradgents.com

USERADGENTS | Agence digitale mobile-first

Agence digitale mobile first spécialisée dans la conception, le design et le développement de sites web, d'applications mobiles, d'expériences en magasin et ...

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

Quel est mon agent utilisateur

Cette page vous montre ce que votre navigateur Web envoie dans l'en-tête "User-Agent" pour vos requêtes HTTP. Vous voulez savoir quels en-têtes votre ...

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

What is my user agent? - WhatIsMyBrowser.com

2024-06-25 00:00:00

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://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.infowebmaster.fr › outils › mon-user-agent.php

Connaître Mon User Agent

Mon User Agent. Cet outil permet de vous indiquer votre user agent. Le user agent est un code envoyé par chaque navigateur web lors d'une connexion à un ...

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https://developer.mozilla.org › fr › docs › Glossary › User_agent

Agent utilisateur - Glossaire MDN : définitions des termes du ...

17 déc. 2024 — Un agent utilisateur est un programme informatique qui représente une personne, par exemple, un navigateur dans le cadre d'une utilisation ...

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https://www.abondance.com › definition › user-agent

Définition : Qu'est-ce qu'un User Agent en SEO ? - Abondance

26 oct. 2023 — Un user agent, ou agent utilisateur, est un programme qui accède à un contenu web : crawler, navigateur ou encore application.

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

2025: List of User-Agent strings | DeviceAtlas

A comprehensive list of User Agent strings for the most popular devices in use today. It includes Android, iPhone, Windows, tablets, desktops, bots and ...

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https://chromewebstore.google.com › detail › user-agent-switcher › kchfmpdcejfkipopnolndinkeoipnoia

User Agent Switcher - Chrome Web Store

26 juin 2025 — With this chrome extension, you can quickly and easily switch between user-agent strings. Also, you can set up specific URLs that you want to ...

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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, ...

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

Qu'est-ce que la réduction user-agent - Privacy Sandbox

23 avr. 2025 — La chaîne User-Agent est un en-tête de requête HTTP qui permet aux serveurs et aux réseaux d'identifier l'application, le système d'exploitation ...

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https://whatmyuseragent.com

What's My User Agent?

Useragent is a small piece of data that is sent by your web browser when accessing a website or application. It is used to identify the type of browser you are ...

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