---

c: Copyright (C) Daniel Stenberg, daniel@haxx.se, et al. SPDX-License-Identifier: curl Long: proto-default Help: Use PROTOCOL for any URL missing a scheme Arg: Added: 7.45.0 Category: connection curl Multi: single See-also:

• proto
• proto-redir Example:
• --proto-default https ftp.example.com

---

--proto-default

Use protocol for any provided URL missing a scheme.

An unknown or unsupported protocol causes error CURLE_UNSUPPORTED_PROTOCOL.

This option does not change the default proxy protocol (http).

Without this option set, curl guesses protocol based on the hostname, see --url for details.