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curl/docs/cmdline-opts/user-agent.d

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+Short: A
+Long: user-agent
+Arg: <name>
+Help: Send User-Agent <name> to server
+Protocols: HTTP
+Category: important http
+---
+
+Specify the User-Agent string to send to the HTTP server. To encode blanks in
+the string, surround the string with single quote marks. This header can also
+be set with the --header or the --proxy-header options.
+
+If you give an empty argument to --user-agent (""), it will remove the header
+completely from the request. If you prefer a blank header, you can set it to a
+single space (" ").
+
+If this option is used several times, the last one will be used.