On the Web, a user agent is a software agent responsible for retrieving and facilitating end-user interaction with Web content. This includes all web browsers, such as Google Chrome and Safari, some email clients, standalone download managers like youtube-dl, and other command-line utilities ...
2025年10月28日 · The HTTP User-Agent request header is a characteristic string that lets servers and network peers identify the application, operating system, vendor, and/or ...User-Agent reduction · Pre-user-agent reduction...
Ever needed to quickly switch between user-agent strings on the fly? Developing a site that needs to work on both mobile browsers and desktop browsers? Sick of some archaic site blocking you because you're not using Netscape 4? The User-Agent Switcher for Chrome is the answer.
Basically User-Agent is a relic of the past, at least in theory (in browsers that is, in crawlers aka web spiders it can make sense). Browsers should not depend on its value, but some questionably made sites still do sometimes. You nearly never have to change it, that tiny percentage is annoying though. More on reddit.com
The User-Agents.Net website provides various user agent lists and technical information about them.
2025年7月6日 · HTTP User-Agent 請求標頭是一個讓伺服器和網路對等端識別發起請求的使用者代理的應用程式、操作系統、供應商和/或版本的特徵字串。
使用者代理（英語：user agent）在電腦科學中指的是代表使用者行為的程式（軟體代理程式（英語：Software agent））。例如，網頁瀏覽器就是一個「幫助使用者取得、渲染網頁內容 ...
2024年8月29日 · UserAgent 又稱使用者代理，是網站與伺服器用來辨識使用者行為的標記。所謂的使用者代理，意思是我們所操作的電腦、手機等裝置，以及上面用來瀏覽網頁的瀏覽 ...
UserAgent是指浏览器,它的信息包括硬件平台、系统软件、应用软件和用户个人偏好，通过UA可以分析出浏览器名称、浏览器版本号、渲染引擎、操作系统。使用方法直接打开查看即 ...
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. Your web browser sends it to every website you visit.
Usage example: You can alter your user-agent string to indicate you?re on a mobile device if you prefer seeing mobile versions of sites so they load quicker. -- This extension allows you to spoof your browser "user-agent" string to a custom designation, making it impossible for websites to know specific details about your browsing arrangement.
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.
User-Agent is like a secret code your browser shares with every website you visit. It reveals details about your browser, your operating system, and even some plugins you have installed.
What is a user agent? A user agent is a small piece of text that your web browser or script sends during an HTTP request to identify the client's software and operating system to the web server.
The User Agent Accessibility Guidelines (UAAG) documents explain how to make user agents accessible to people with disabilities. User agents include browsers, browser extensions, media players, readers and other applications that render web content.
A user agent is software used to communicate with the Internet. The user agent software submits requests for Web content on behalf of the user, and receives and displays the content on the user’s device.
Get your users agent string, web browser, opera system, device information and more... Useragent is a small piece of data that is sent by your web browser when accessing a website or application.
This extension is designed to shield your online privacy and make it super easy to appear as if you're browsing from different devices.
A user agent is a computer program representing a person, for example, a browser in a Web context.
This document proposes a mechanism which might allow user agents to be a bit more aggressive about removing entropy from the User-Agent string generally by giving servers that really need some specific details about the client the ability to opt-into receiving them.
UAAG 2.0 guides developers in designing user agents that make the web more accessible to people with disabilities. User agents include browsers, browser extensions, media players, readers and other applications that render web content. A user agent that follows UAAG 2.0 will improve accessibility ...
Displays the browser User-Agent and other useful device info. Data can be shared by email, text, etc. NOTE: Some phones may report a different default User-Agent from within apps (such as this) compared to the browser. Be sure to double-check. Suggestions for improvements and additional features are welcome.
We've collected millions of user agents and have categorised a selection of them here for you, based on many of the things we detect about them - Operating System, Browser, Hardware Type, Browser Type, and so on.
Most common User Agent list up to date. Essential for web scraping, testing, and bot development. Covers browsers, crawlers, and AI agents. Updated weekly.