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Browser sniffing (also known as browser detection) is a set of techniques used in websites and web applications in order to determine the web browser a visitor is using, and to serve browser-appropriate content to the visitor. It is also used to detect mobile browsers and send them mobile-optimized websites.
Feature detection (also feature testing) is a technique used in web development for handling differences between runtime environments (typically web browsers or user agents), by programmatically testing for clues that the environment may or may not offer certain functionality.
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 .
The user agent string format is currently specified by section 10.1.5 of HTTP Semantics. The format of the user agent string in HTTP is a list of product tokens (keywords) with optional comments. For example, if a user's product were called WikiBrowser, their user agent string might be WikiBrowser/1.0 Gecko/1.0. The "most important" product ...
Newer browsers provide added benefits, such as increased web surfing security, private browsing, and faster web page uploads. To get the best experience with AOL websites and applications, it's important to use the latest version of a supported browser. • Safari - Get it for the first time or update your current version.
As of 2014 the technique is widespread in many websites, used by at least a dozen high-profile web ads and user tracking suppliers. [ 11 ] In 2022, the capabilities of canvas fingerprinting were much deepened by taking minute differences between nominally identical units of the same GPU model into account.
Websites often include code to detect the browser version to adjust the page design sent according to the user agent string received. This may mean that less popular browsers are not sent complex content (even though they might be able to deal with it correctly) or, in extreme cases, refused all content. [8]
Around the same time, the specifications for how web browser would be handling HTTP Client Hints on the web was published as a draft in a W3C Community Group Report. [ 2 ] In 2020, Google announced their intention to deprecate user-agent (UA) declaration by the browser. [ 4 ]