Onthe Web, auser agent is asoftware agent responsible for retrieving and facilitatingend-user interaction with Web content.[1] This includes allweb browsers, such asGoogle Chrome andSafari, someemail clients, standalonedownload managers likeyoutube-dl, and othercommand-line utilities likecURL.[2]
The user agent is the client in aclient–server system. TheHTTPUser-Agent header is intended to clearly identify the agent to the server.[2] However, this header can be omitted orspoofed,[2] so some websites useother detection methods.
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