diff --git a/.travis.yml b/.travis.yml
index 10b3f169..90064caf 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -5,10 +5,9 @@ os:
 go:
   - 1.12.x
 go_import_path: github.com/kataras/iris
-# we disable test caching via GOCACHE=off
-# env:
-#  global:
-#    - GOCACHE=off
+env:
+ global:
+   - GO111MODULE=on
 install:
   - go get ./...
 script:
diff --git a/httptest/httptest_go19.go b/httptest/httptest_go19.go
new file mode 100644
index 00000000..0bcd5ad3
--- /dev/null
+++ b/httptest/httptest_go19.go
@@ -0,0 +1,8 @@
+// +build go1.9
+
+package httptest
+
+import "github.com/gavv/httpexpect"
+
+// Request type alias.
+type Request = httpexpect.Request
diff --git a/sessions/cookie.go b/sessions/cookie.go
index 5a0bf359..23d47534 100644
--- a/sessions/cookie.go
+++ b/sessions/cookie.go
@@ -115,6 +115,7 @@ func formatCookieDomain(ctx context.Context, disableSubdomainPersistence bool) s
 			requestDomain = requestDomain[dotIdx+1:]
 		}
 	}
+
 	// finally set the .localhost.com (for(1-level) || .mysubdomain.localhost.com (for 2-level subdomain allow)
 	return "." + requestDomain // . to allow persistence
 }
diff --git a/sessions/sessions.go b/sessions/sessions.go
index 046972d3..e829a4d5 100644
--- a/sessions/sessions.go
+++ b/sessions/sessions.go
@@ -177,12 +177,12 @@ func (s *Sessions) decodeCookieValue(cookieValue string) string {
 		return ""
 	}
 
-	var cookieValueDecoded *string
+	var cookieValueDecoded string
 
 	if decode := s.config.Decode; decode != nil {
 		err := decode(s.config.Cookie, cookieValue, &cookieValueDecoded)
 		if err == nil {
-			cookieValue = *cookieValueDecoded
+			cookieValue = cookieValueDecoded
 		} else {
 			cookieValue = ""
 		}
diff --git a/sessions/sessions_test.go b/sessions/sessions_test.go
index 9457d5a0..c0d52546 100644
--- a/sessions/sessions_test.go
+++ b/sessions/sessions_test.go
@@ -17,7 +17,7 @@ func TestSessions(t *testing.T) {
 }
 
 const (
-	testEnableSubdomain = false
+	testEnableSubdomain = true
 )
 
 func testSessions(t *testing.T, sess *sessions.Sessions, app *iris.Application) {
@@ -35,16 +35,14 @@ func testSessions(t *testing.T, sess *sessions.Sessions, app *iris.Application)
 	}
 
 	if testEnableSubdomain {
-		app.Party("subdomain.").Get("/get", func(ctx context.Context) {
-			writeValues(ctx)
-		})
+		app.Party("subdomain.").Get("/get", writeValues)
 	}
 
 	app.Post("/set", func(ctx context.Context) {
 		s := sess.Start(ctx)
 		vals := make(map[string]interface{}, 0)
 		if err := ctx.ReadJSON(&vals); err != nil {
-			t.Fatalf("Cannot readjson. Trace %s", err.Error())
+			t.Fatalf("Cannot read JSON. Trace %s", err.Error())
 		}
 		for k, v := range vals {
 			s.Set(k, v)
@@ -84,10 +82,11 @@ func testSessions(t *testing.T, sess *sessions.Sessions, app *iris.Application)
 	e.POST("/set").WithJSON(values).Expect().Status(iris.StatusOK).Cookies().NotEmpty()
 	e.GET("/get").Expect().Status(iris.StatusOK).JSON().Object().Equal(values)
 	if testEnableSubdomain {
-		es := httptest.New(t, app, httptest.URL("http://subdomain.example.com"))
+		es := e.Builder(func(req *httptest.Request) {
+			req.WithURL("http://subdomain.example.com")
+		})
 		es.Request("GET", "/get").Expect().Status(iris.StatusOK).JSON().Object().Equal(values)
 	}
-
 	// test destroy which also clears first
 	d := e.GET("/destroy").Expect().Status(iris.StatusOK)
 	d.JSON().Object().Empty()