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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. [2] The user agent is the client in a client–server system. The HTTP User-Agent header is intended to clearly identify the agent to the server. [2]
In computing, the User-Agent header is an HTTP header intended to identify the user agent responsible for making a given HTTP request. Whereas the character sequence User-Agent comprises the name of the header itself, the header value that a given user agent uses to identify itself is colloquially known as its user agent string.
User-agent headers are text sent by a client to a server to identify the client. While initially intended for statistical purposes, these headers had increasingly became a tool for tracking users across websites. Client Hints aimed to address this issue by providing a more controlled way to share the same information.
Browser support for HTTP Public Key Pinning Browser Version added Version deprecated Version removed Notes Google Chrome 46 [11] 67 [12] 72 [13] [14] Opera 33 [15] 54 [16] 60 Firefox 35 72 [17] [18] — Can be enabled by setting flag security.cert_pinning.hpkp.enabled to true. [19] Internet Explorer — [20] — — Microsoft Edge — [20 ...
The following header names are in use as part of experimental CSP implementations: [3] Content-Security-Policy – standard header name proposed by the W3C document. Google Chrome supports this as of version 25. [7] Firefox supports this as of version 23, [8] released on 6 August 2013. [9] WebKit supports this as of version 528 (nightly build ...
An issue inherent to indiscriminate link prefetching involves the misuse of "safe" HTTP methods.The HTTP GET and HEAD requests are said to be "safe", i.e., a user agent that issues one of these requests should expect that the request results in no change on the recipient server. [13]