diff --git a/httpstub.go b/httpstub.go
index bd54d92..4109dc1 100644
--- a/httpstub.go
+++ b/httpstub.go
@@ -86,6 +86,14 @@ func NewServer(t *testing.T) *Router {
 	return rt
 }
 
+// NewTLSServer returns a new router including TLS *httptest.Server.
+func NewTLSServer(t *testing.T) *Router {
+	t.Helper()
+	rt := &Router{t: t}
+	_ = rt.TLSServer()
+	return rt
+}
+
 // Client returns *http.Client which requests *httptest.Server.
 func (rt *Router) Client() *http.Client {
 	if rt.server == nil {
@@ -101,7 +109,19 @@ func (rt *Router) Server() *httptest.Server {
 		rt.server = httptest.NewServer(rt)
 	}
 	client := rt.server.Client()
-	client.Transport = newTransport(rt.server.URL)
+	tp := client.Transport.(*http.Transport)
+	client.Transport = newTransport(rt.server.URL, tp)
+	return rt.server
+}
+
+// TLSServer returns TLS *httptest.Server with *Router set.
+func (rt *Router) TLSServer() *httptest.Server {
+	if rt.server == nil {
+		rt.server = httptest.NewTLSServer(rt)
+	}
+	client := rt.server.Client()
+	tp := client.Transport.(*http.Transport)
+	client.Transport = newTransport(rt.server.URL, tp)
 	return rt.server
 }
 
@@ -274,17 +294,19 @@ func pathMatchFunc(path string) matchFunc {
 
 type transport struct {
 	URL *url.URL
+	tp  *http.Transport
 }
 
-func newTransport(rawURL string) http.RoundTripper {
+func newTransport(rawURL string, tp *http.Transport) http.RoundTripper {
 	u, _ := url.Parse(rawURL)
 	return &transport{
 		URL: u,
+		tp:  tp,
 	}
 }
 
 func (t *transport) transport() http.RoundTripper {
-	return http.DefaultTransport
+	return t.tp
 }
 
 func (t *transport) CancelRequest(r *http.Request) {
diff --git a/httpstub_test.go b/httpstub_test.go
index d62129e..1ed82d9 100644
--- a/httpstub_test.go
+++ b/httpstub_test.go
@@ -291,3 +291,46 @@ func TestRequests(t *testing.T) {
 		t.Errorf("got %v\nwant %v", len(m.Requests()), 1)
 	}
 }
+
+func TestTLSServer(t *testing.T) {
+	r := NewRouter(t)
+	r.Method(http.MethodGet).Path("/api/v1/users/1").Header("Content-Type", "application/json").ResponseString(http.StatusOK, `{"name":"alice"}`)
+	ts := r.TLSServer()
+	t.Cleanup(func() {
+		ts.Close()
+	})
+	tc := ts.Client()
+	res, err := tc.Get("https://example.com/api/v1/users/1")
+	if err != nil {
+		t.Fatal(err)
+	}
+	t.Cleanup(func() {
+		res.Body.Close()
+	})
+	body, err := io.ReadAll(res.Body)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	{
+		got := res.StatusCode
+		want := http.StatusOK
+		if got != want {
+			t.Errorf("got %v\nwant %v", got, want)
+		}
+	}
+	{
+		got := res.Header.Get("Content-Type")
+		want := "application/json"
+		if got != want {
+			t.Errorf("got %v\nwant %v", got, want)
+		}
+	}
+	{
+		got := string(body)
+		want := `{"name":"alice"}`
+		if got != want {
+			t.Errorf("got %v\nwant %v", got, want)
+		}
+	}
+}