curl

—connect-to

Syntax: --connect-to <HOST1:PORT1:HOST2:PORT2>

• ”HOST1” and “PORT1” may be the empty string, meaning “any host/port”. “HOST2” and “PORT2” may also be the empty string, meaning “use the request’s original host/port”.
• Added in curl 7.49.0
• Example: curl --connect-to ::<IP> <URL>

Compared to --resolve, it can adapt to the request’s original port.