Use first port by default

If no information is given, use first index of ports

provider/marathon.go

@@ -219,10 +219,7 @@ func (provider *Marathon) taskFilter(task marathon.Task, applications *marathon.
 		log.Debugf("Filtering marathon task %s specifying both traefik.portIndex and traefik.port labels", task.AppID)
 		return false
 	}
-	if portIndexLabel == "" && portValueLabel == "" && len(application.Ports) > 1 {
-		log.Debugf("Filtering marathon task %s with more than 1 port and no traefik.portIndex or traefik.port label", task.AppID)
-		return false
-	}
+
 	if portIndexLabel != "" {
 		index, err := strconv.Atoi((*application.Labels)["traefik.portIndex"])
 		if err != nil || index < 0 || index > len(application.Ports)-1 {

provider/marathon_test.go

@@ -372,7 +372,7 @@ func TestMarathonTaskFilter(t *testing.T) {
 		{
 			task: marathon.Task{
 				AppID: "multiple-ports",
-				Ports: []int{80},
+				Ports: []int{80, 443},
 			},
 			applications: &marathon.Applications{
 				Apps: []marathon.Application{
@@ -383,7 +383,7 @@ func TestMarathonTaskFilter(t *testing.T) {
 					},
 				},
 			},
-			expected:         false,
+			expected:         true,
 			exposedByDefault: true,
 		},
 		{
@@ -927,12 +927,12 @@ func TestMarathonGetPort(t *testing.T) {
 		{
 			applications: []marathon.Application{
 				{
-					ID:     "test1",
+					ID:     "multiple-ports-take-first",
 					Labels: &map[string]string{},
 				},
 			},
 			task: marathon.Task{
-				AppID: "test1",
+				AppID: "multiple-ports-take-first",
 				Ports: []int{80, 443},
 			},
 			expected: "80",