1 Long: proto-default 2 Help: Use PROTOCOL for any URL missing a scheme 3 Arg: <protocol> 4 Added: 7.45.0 5 Category: connection curl 6 Example: --proto-default https ftp.example.com 7 --- 8 Tells curl to use *protocol* for any URL missing a scheme name. 9 10 An unknown or unsupported protocol causes error 11 *CURLE_UNSUPPORTED_PROTOCOL* (1). 12 13 This option does not change the default proxy protocol (http). 14 15 Without this option set, curl guesses protocol based on the host name, see 16 --url for details. 17