bind: support multiple values (#2128)

Signed-off-by: Shengjing Zhu <i@zhsj.me>

caddyhttp/httpserver/https_test.go

@@ -19,6 +19,7 @@ import (
 	"net"
 	"net/http"
 	"net/http/httptest"
+	"reflect"
 	"testing"
 
 	"github.com/mholt/caddy/caddytls"
@@ -28,7 +29,7 @@ func TestRedirPlaintextHost(t *testing.T) {
 	for i, testcase := range []struct {
 		Host        string // used for the site config
 		Port        string
-		ListenHost  string
+		ListenHosts []string
 		RequestHost string // if different from Host
 	}{
 		{
@@ -43,13 +44,17 @@ func TestRedirPlaintextHost(t *testing.T) {
 			Port: "1234",
 		},
 		{
-			Host:       "foohost",
-			ListenHost: "93.184.216.34",
+			Host:        "foohost",
+			ListenHosts: []string{"93.184.216.34"},
 		},
 		{
-			Host:       "foohost",
-			Port:       "1234",
-			ListenHost: "93.184.216.34",
+			Host:        "foohost",
+			Port:        "1234",
+			ListenHosts: []string{"93.184.216.34"},
+		},
+		{
+			Host:        "foohost",
+			ListenHosts: []string{"127.0.0.1", "127.0.0.2"},
 		},
 		{
 			Host: "foohost",
@@ -70,15 +75,15 @@ func TestRedirPlaintextHost(t *testing.T) {
 				Host: testcase.Host,
 				Port: testcase.Port,
 			},
-			ListenHost: testcase.ListenHost,
-			TLS:        new(caddytls.Config),
+			ListenHosts: testcase.ListenHosts,
+			TLS:         new(caddytls.Config),
 		})
 
 		// Check host and port
 		if actual, expected := cfg.Addr.Host, testcase.Host; actual != expected {
 			t.Errorf("Test %d: Expected redir config to have host %s but got %s", i, expected, actual)
 		}
-		if actual, expected := cfg.ListenHost, testcase.ListenHost; actual != expected {
+		if actual, expected := cfg.ListenHosts, testcase.ListenHosts; !reflect.DeepEqual(actual, expected) {
 			t.Errorf("Test %d: Expected redir config to have bindhost %s but got %s", i, expected, actual)
 		}
 		if actual, expected := cfg.Addr.Port, HTTPPort; actual != expected {