Error on socket file not existing in advance

[fangism]

I tried the following:

$ ./gocat unix-to-tcp --src /tmp/foo.sock --dst buildeventservice.googleapis.com:443
couldn't create relay from unix socket to TCP
 --- at /usr/local/home/fangism/gocat/cmd/unix_to_tcp.go:60 (NewUnixToTCPCmd.func1) ---
Caused by: could not stat /tmp/sponge.sock
 --- at /usr/local/home/fangism/gocat/internal/relay/unix_socket_tcp.go:59 (NewUnixSocketTCP) ---
Caused by: stat /tmp/foo.sock: no such file or directory

/tmp/foo.sock did not exist ahead of running gocat.
Should gocat create that socket file when opening it? Other proxy-like tools I've used didn't require the socket file to exist in advance.
Or am I simply using it incorrectly?