The HTTP User-Agent request header is a characteristic string that lets servers and network peers identify the application, operating system, vendor, and/or version of the requesting user agent.
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.
On the Web, a user agent is a software agent responsible for retrieving and facilitating end-user interaction with Web content. [1] 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 like cURL.
Find out your user agent string, browser, opera system, device and more with this tool. Learn what a user agent is and how it is used for feature detection and compatibility.
11 Ιουλ 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 ...
This extension is designed to shield your online privacy and make it super easy to appear as if you're browsing from different devices.
List of user agents categorized by device and platform. Utility to parse user agents and get information like operative system device
The HTTP header User-Agent is a request header that sends a characteristic string to web servers, allowing them to identify the Operating System (OS) and browser of the client making the request. Every time your browser connects to a website, it includes the User-Agent field in the HTTP header.
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, ...
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.
The User-Agent (UA) string is contained in the HTTP headers and is intended to identify devices requesting online content. The User-Agent tells the server what the visiting device is (among many other things) and this information can be used ...
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. Please note that this does not provide improved privacy while browsing the Internet and that some sites might have other means to figure out that the browser is not what it pretends to be.
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.
er agent is a text string sent by your browser or script during an HTTP request to identify the client’s software and operating environment to the server. It typically includes the browser name, version, operating system, and, occasionally, the device type.
Personalization is not the same as “remembering everything.” In practice, agent state usually falls into three categories: Short-term context: Information needed to complete the current task. This belongs in the prompt. Session state: Temporary decisions or selections made during a workflow. This should be structured and scoped to a session. Long-term memory: Durable user preferences or facts that should persist across sessions.
This module is for generating random, valid web user agents:
>>> from user_agent import generate_user_agent, generate_navigator >>> from pprint import pprint >>> generate_user_agent() 'Mozilla/5.0 (compatible; MSIE 8.0; Windows NT 6.3; Win64; x64)' >>> generate_user_agent(os=('mac', 'linux')) 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8; rv:36.0) Gecko/20100101 Firefox/36.0' >>> pprint(generate_navigator()) {'app_code_name': 'Mozilla', 'app_name': 'Netscape', 'appversion': '5.0', 'name': 'firefox', 'os': 'linux', 'oscpu': 'Linux i686 on x86_64', 'platform': 'Linux i686 on x86_64', 'user_agent': 'Mozilla/5.0 (X11; Ubuntu; Linux i686 on x86_64; rv:41.0) Gecko/20100101 Firefox/41.0', 'version': '41.0'} >>> pprint(generate_navigator_js()) {'appCodeName': 'Mozilla', 'appName': 'Netscape', 'appVersion': '38.0', 'platform': 'MacIntel', 'userAgent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9; rv:38.0) Gecko/20100101 Firefox/38.0'}
That Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/138.0.0.0 Safari/537.36 user-agent header is the one used by the most recent Chrome on macOS—which is a little odd here as the Sec-Ch-Ua-Platform : “Linux” indicates that the agent browser runs on Linux.
Beginner's Guide to User-Agent HTTP Headers in Testing Learn what a User-Agent Header is, how it works, and how to test it effectively. Use Requestly to modify and test different User-Agent strings easily.
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Discover what a user agent is and how it facilitates web interactions. Learn about User-Agent strings and their role in web optimization.
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19 Φεβ 2025 — A user agent is a crucial component of the HTTP communication process. Essentially, it's the string of text sent by a web browser (or any other client) to ...
Your user agent is a string that web servers use to identify your browser and optimize content delivery. Learn what a user agent is, how to troubleshoot browser issues, and see your user agent details on this site.
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User-agent Attributes User-agent OS Attributes User-agent Attributes Describes user-agent attributes. Attributes: Key Stability Value Type Description Example Values user_agent.name string Name of the user-agent extracted from original. Usually refers to the browser’s name.
if (FALSE) { GET("http://httpbin.org/user-agent") GET("http://httpbin.org/user-agent", user_agent("httr")) } Run the code above in your browser using DataLab