CNAME flattening

integration/fixtures/simple_hostresolver.toml

@@ -0,0 +1,16 @@
+logLevel = "DEBUG"
+defaultEntryPoints = ["http"]
+
+[entryPoints]
+  [entryPoints.http]
+  address = ":8000"
+
+[api]
+
+[docker]
+exposedByDefault = false
+domain = "docker.local"
+watch = true
+
+[hostResolver]
+cnameFlattening = true

integration/hostresolver_test.go

@@ -0,0 +1,54 @@
+package integration
+
+import (
+	"net/http"
+	"time"
+
+	"github.com/containous/traefik/integration/try"
+	"github.com/go-check/check"
+	checker "github.com/vdemeester/shakers"
+)
+
+type HostResolverSuite struct{ BaseSuite }
+
+func (s *HostResolverSuite) SetUpSuite(c *check.C) {
+	s.createComposeProject(c, "hostresolver")
+
+	s.composeProject.Start(c)
+	s.composeProject.Container(c, "server1")
+}
+
+func (s *HostResolverSuite) TestSimpleConfig(c *check.C) {
+	cmd, display := s.traefikCmd(withConfigFile("fixtures/simple_hostresolver.toml"))
+	defer display(c)
+
+	err := cmd.Start()
+	c.Assert(err, checker.IsNil)
+	defer cmd.Process.Kill()
+
+	testCase := []struct {
+		desc   string
+		host   string
+		status int
+	}{
+		{
+			desc:   "host request is resolved",
+			host:   "www.github.com",
+			status: http.StatusOK,
+		},
+		{
+			desc:   "host request is not resolved",
+			host:   "frontend.docker.local",
+			status: http.StatusNotFound,
+		},
+	}
+
+	for _, test := range testCase {
+		req, err := http.NewRequest(http.MethodGet, "http://127.0.0.1:8000/", nil)
+		c.Assert(err, checker.IsNil)
+		req.Host = test.host
+
+		err = try.Request(req, 500*time.Millisecond, try.StatusCodeIs(test.status), try.HasBody())
+		c.Assert(err, checker.IsNil)
+	}
+}

integration/integration_test.go

@@ -51,6 +51,7 @@ func init() {
 		check.Suite(&FileSuite{})
 		check.Suite(&GRPCSuite{})
 		check.Suite(&HealthCheckSuite{})
+		check.Suite(&HostResolverSuite{})
 		check.Suite(&HTTPSSuite{})
 		check.Suite(&LogRotationSuite{})
 		check.Suite(&MarathonSuite{})

integration/resources/compose/hostresolver.yml

@@ -0,0 +1,8 @@
+server1:
+  image: emilevauge/whoami
+  labels:
+    - traefik.enable=true
+    - traefik.port=80
+    - traefik.backend=backend1
+    - traefik.frontend.entryPoints=http
+    - traefik.frontend.rule=Host:github.com