Use net.JoinHostPort for servers URL

provider/docker/config.go

@@ -3,6 +3,7 @@ package docker
 import (
 	"context"
 	"fmt"
+	"net"
 	"strconv"
 	"strings"
 	"text/template"
@@ -336,7 +337,7 @@ func (p *Provider) getServers(containers []dockerData) map[string]types.Server {
 		}
 
 		servers[provider.Normalize(serverName)] = types.Server{
-			URL:    fmt.Sprintf("%s://%s:%s", protocol, ip, port),
+			URL:    fmt.Sprintf("%s://%s", protocol, net.JoinHostPort(ip, port)),
 			Weight: label.GetIntValue(container.SegmentLabels, label.TraefikWeight, label.DefaultWeight),
 		}
 	}

provider/ecs/config.go

@@ -2,6 +2,7 @@ package ecs
 
 import (
 	"fmt"
+	"net"
 	"strconv"
 	"strings"
 	"text/template"
@@ -134,7 +135,7 @@ func getServers(instances []ecsInstance) map[string]types.Server {
 
 		serverName := provider.Normalize(fmt.Sprintf("server-%s-%s", instance.Name, instance.ID))
 		servers[serverName] = types.Server{
-			URL:    fmt.Sprintf("%s://%s:%s", protocol, host, port),
+			URL:    fmt.Sprintf("%s://%s", protocol, net.JoinHostPort(host, port)),
 			Weight: label.GetIntValue(instance.TraefikLabels, label.TraefikWeight, label.DefaultWeight),
 		}
 	}

provider/marathon/config.go

@@ -4,6 +4,7 @@ import (
 	"errors"
 	"fmt"
 	"math"
+	"net"
 	"strconv"
 	"strings"
 	"text/template"
@@ -340,7 +341,7 @@ func (p *Provider) getServer(app appData, task marathon.Task) (string, *types.Se
 	serverName := provider.Normalize("server-" + app.ID + "-" + task.ID + getSegmentNameSuffix(app.SegmentName))
 
 	return serverName, &types.Server{
-		URL:    fmt.Sprintf("%s://%s:%v", protocol, host, port),
+		URL:    fmt.Sprintf("%s://%s", protocol, net.JoinHostPort(host, port)),
 		Weight: label.GetIntValue(app.SegmentLabels, label.TraefikWeight, label.DefaultWeight),
 	}, nil
 }

provider/mesos/config.go

@@ -3,6 +3,7 @@ package mesos
 import (
 	"fmt"
 	"math"
+	"net"
 	"strconv"
 	"strings"
 	"text/template"
@@ -185,7 +186,7 @@ func (p *Provider) getServers(tasks []taskData) map[string]types.Server {
 
 		serverName := "server-" + getID(task)
 		servers[serverName] = types.Server{
-			URL:    fmt.Sprintf("%s://%s:%s", protocol, host, port),
+			URL:    fmt.Sprintf("%s://%s", protocol, net.JoinHostPort(host, port)),
 			Weight: getIntValue(task.TraefikLabels, label.TraefikWeight, label.DefaultWeight, math.MaxInt32),
 		}
 	}

provider/rancher/config.go

@@ -2,6 +2,7 @@ package rancher
 
 import (
 	"fmt"
+	"net"
 	"strconv"
 	"strings"
 	"text/template"
@@ -181,7 +182,7 @@ func getServers(service rancherData) map[string]types.Server {
 
 		serverName := "server-" + strconv.Itoa(index)
 		servers[serverName] = types.Server{
-			URL:    fmt.Sprintf("%s://%s:%s", protocol, ip, port),
+			URL:    fmt.Sprintf("%s://%s", protocol, net.JoinHostPort(ip, port)),
 			Weight: weight,
 		}
 	}