What are user agent strings?

What are user agent strings?

A browser’s User-Agent string (UA) helps identify which browser is being used, what version, and on which operating system. Like all other browsers, Chrome for Android sends this information in the User-Agent HTTP header every time it makes a request to any site.

What is an example of a user agent?

Browsers like Mozilla Firefox, Google’s Chrome as well as Safari and Opera are examples of user agents. However, other applications can also act as user agents. Examples are: Crawlers: Googlebot, Yahoo!

What are the two types of user agent?

User-Agent list for different device types

  • Android User Agents.
  • iPhone User Agents.
  • MS Windows User Agents.
  • Tablet User Agents.
  • Desktop User Agents.

How many Useragents are there?

Browse our database of 134.9 million User Agents – WhatIsMyBrowser.com.

Does Firefox still use Gecko?

Since all Firefox OS apps are Web apps, Firefox OS uses Gecko as its app runtime as well.

What is Gecko in user agent?

KHTML – originally developed for Konquerer on Linux’s KDE desktop – added the words “like Gecko” so they’d get the modern pages designed for Gecko, too. WebKit was based on KHTML – when it was developed, they added the word WebKit and kept the original “KHTML, like Gecko” line for compatibility purposes.

What user agent string can be used for Gmail?

The following table shows the crawlers used by various products and services at Google: The user agent token is used in the User-agent: line in robots….APIs-Google.

User agent token APIs-Google
Full user agent string APIs-Google (+https://developers.google.com/webmasters/APIs-Google.html)

How do I find my Chrome user agent?

Google Chrome Chrome’s user agent switcher is part of its Developer Tools. Open them by clicking the menu button and selecting More Tools > Developer Tools. You can also use press Ctrl+Shift+I on your keyboard.

How do I write a user agent string?


  1. Syntax. User-Agent: /
  2. Firefox UA string. For more on Firefox- and Gecko-based user agent strings, see the Firefox user agent string reference.
  3. Chrome UA string.
  4. Opera UA string.
  5. Microsoft Edge UA string.
  6. Safari UA string.
  7. Internet Explorer UA string.
  8. Crawler and bot UA strings.

What is the best user agent?

Slurp Bot.

  • DuckDuckBot.
  • Baiduspider.
  • Yandex Bot.
  • Sogou Spider.
  • Exabot.
  • 9. Facebook external hit. Facebook allows its users to send links to interesting web content to other Facebook users.
  • Alexa crawler. ia_archiver is the web crawler for Amazon’s Alexa internet rankings.
  • Can user agent be spoofed?

    In user-agent spoofing, bad actors modify elements of the user agent string to obfuscate details of their traffic. For example, making high traffic volumes from a single device look like lots of individual advertising engagements from multiple devices.

    What browser uses Gecko?

    Gecko is written in C++ and JavaScript, and, since 2016, additionally in Rust. It is free and open-source software subject to the terms of the Mozilla Public License version 2. Mozilla officially supports its use on Android, Linux, macOS, and Windows.

    Syntax. A product identifier – its name or development codename.

  • Firefox UA string.
  • Chrome UA string.
  • Opera UA string.
  • Safari UA string.
  • Internet Explorer UA string.
  • Crawler and bot UA strings
  • Library and net tool UA strings.
  • Specifications.
  • Browser compatibility
  • What is a mobile user agent string?

    A user agent is a “string” – that is, a line of text – identifying the browser and operating system to the web server. This sounds simple, but user agents have become a mess over time. When your browser connects to a website, it includes a User-Agent field in its HTTP header.

    What is user-agent string sent?

    A user agent is the string which describes platform, operating system and browser. User Agent is sent by the browser with other HTTP Headers to let the web server know its identity. All web browers provide a built-in User Agent string, but they can be also modified by a user.

    What is an example of an user agent?

    Web Browsers: Google Chrome,Safari,Firefox,Microsoft Edge,Opera,and more.

  • Bots: Googlebot,Baidu Spider,BingBot,Yandex Bot,and more.
  • Consoles: Playstation,Wii,Nintendo,and etc.
  • Programming Tools: wget,Snoopy,and etc.
  • Link checker: W3C-checklink
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