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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.
User agent sniffing is considered poor practice, since it encourages browser-specific design and penalizes new browsers with unrecognized user agent identifications. Instead, the W3C recommends creating standard HTML markup, [ 11 ] allowing correct rendering in as many browsers as possible, and to test for specific browser features rather than ...
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 .
Modernizr is a JavaScript library that detects the features available in a user's browser. This lets web pages avoid unsupported features by informing the user their browser is not supported or loading a polyfill. Modernizr aims to provide feature detection in a consistent and easy to use manner that discourages the use of failure-prone browser ...
December #3 12/17: updated browser, crash fixes, auto sign on fixes, and much more! December #2 12/12: incorrect browser user agent, new way to clear formatting in write mail! December #1 12/10: updated browser, fixed .net 8 install for 32 bit OS
This instructs the user agent that the content is stale and should be validated before use. The header field Cache-Control: no-store is intended to instruct a browser application to make a best effort not to write it to disk (i.e not to cache it). The request that a resource should not be cached is no guarantee that it will not be written to disk.
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]
Spoofing some of the information exposed to the fingerprinter (e.g. the user agent) may create a reduction in diversity, [51]: 13 but the contrary could be also achieved if the spoofed information differentiates the user from all the others who do not use such a strategy more than the real browser information.