master-server/deps/curl/docs/cmdline-opts/interface.md

c	SPDX-License-Identifier	Long	Arg	Help	Category	Added	Multi	See-also	Example
Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.	curl	interface	<name>	Use network INTERFACE (or address)	connection	7.3	single	dns-interface	--interface eth0 $URL

--interface

Perform an operation using a specified interface. You can enter interface name, IP address or hostname. An example could look like:

curl --interface eth0:1 https://www.example.com/

On Linux it can be used to specify a VRF, but the binary needs to either have CAP_NET_RAW or to be run as root. More information about Linux VRF: https://www.kernel.org/doc/Documentation/networking/vrf.txt