// returns "com" as the jar key is generated from host.
	}
	prevDot := strings.LastIndex(host[:i-1], ".")
	return host[prevDot+1:]
}

// isIP reports whether host is an IP address.
func isIP(host string) bool {
	if strings.ContainsAny(host, ":%") {
		// Probable IPv6 address.
		// Hostnames can't contain : or %, so this is definitely not a valid host.

	"1.1.1.300":            false,
	"www.foo.bar.net":      false,
	"123.foo.bar.net":      false,
}

func TestIsIP(t *testing.T) {
	for host, want := range isIPTests {
		if got := isIP(host); got != want {
			t.Errorf("%q: got %t, want %t", host, got, want)
		}
	}
}

var defaultPathTests = map[string]string{
	"/":           "/",
	"/abc":        "/",
	"/abc/":       "/abc",