Long: negotiate Help: Use HTTP Negotiate (SPNEGO) authentication Protocols: HTTP See-also: basic ntlm anyauth proxy-negotiate --- Enables Negotiate (SPNEGO) authentication. This option requires a library built with GSS-API or SSPI support. Use --version to see if your curl supports GSS-API/SSPI or SPNEGO. When using this option, you must also provide a fake --user option to activate the authentication code properly. Sending a '-u :' is enough as the user name and password from the --user option aren't actually used. If this option is used several times, only the first one is used.