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A website will probably be crawled by both Googlebot Desktop and Googlebot Mobile. However starting from September 2020, all sites were switched to mobile-first indexing, meaning Google is crawling the web using a smartphone Googlebot. [2] The subtype of Googlebot can be identified by looking at the user agent string in the request.
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 ...
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.
Allows easier parsing of the MakeModel/Firmware that is usually found in the User-Agent String of AT&T Devices: X-Att-Deviceid: GT-P7320/P7320XXLPG: X-Wap-Profile [34] Links to an XML file on the Internet with a full description and details about the device currently connecting. In the example to the right is an XML file for an AT&T Samsung ...
It is also possible to list multiple robots with their own rules. The actual robot string is defined by the crawler. A few robot operators, such as Google, support several user-agent strings that allow the operator to deny access to a subset of their services by using specific user-agent strings. [17] Example demonstrating multiple user-agents:
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 .
Chrome is the most used browser in the U.S., with 61% of the market, according to web traffic analytics firm StatCounter. Google Search has over 88% of the search engine market in the U.S., the ...
In March 2021, 15 attorneys general of U.S. states and Puerto Rico amended an antitrust complaint filed the previous December; the updated complaint says that Google Chrome's phase-out of third-party cookies in 2022 [51] will "disable the primary cookie-tracking technology almost all non-Google publishers currently use to track users and target ...