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Since then, User-Agent headers have become increasingly more complex, and has started containing significant uniquely identifiable information about the user. Often, this information is used to perform browser fingerprinting , allowing sites to track users across sites passively without having to load any JavaScript for the user.
Use of user agent strings are error-prone because the developer must check for the appropriate part, such as "Gecko" instead of "Firefox". They must also ensure that future versions are supported. Furthermore, some browsers allow changing the user agent string, making the technique useless. [3]
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 ...
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 .
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. [10]: 552
A proxy auto-config (PAC) file defines how web browsers and other user agents can automatically choose the appropriate proxy server (access method) for fetching a given URL. A PAC file contains a JavaScript function FindProxyForURL(url, host). This function returns a string with one or more access method specifications.
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 .
It can be random which user script finishes first, creating a race condition. One way to coordinate this is use the mw.hook interface. Perhaps the other script sends a wikipage.content event when it is done, or can be modified to do so (or you can ask the maintainer).