diff --git a/config/config.exs b/config/config.exs
--- a/config/config.exs
+++ b/config/config.exs
@@ -30,4 +30,8 @@
 #     import_config "#{Mix.env}.exs"
 
 config :kolab_wopi,
-  chwala_base_url: "http://localhost/chwala/api/"
+  chwala_base_url: "http://localhost/chwala/api/",
+  http: [ port: 4000 ],
+  https: [ port: 4443,
+           keyfile: "/etc/ssl/certs/acme",
+           certfile: "/etc/ssl/certs/acme" ]
diff --git a/lib/kolab_wopi/api.ex b/lib/kolab_wopi/api.ex
--- a/lib/kolab_wopi/api.ex
+++ b/lib/kolab_wopi/api.ex
@@ -20,9 +20,29 @@
   end
 
   def start_link do
-    {:ok, _} = Plug.Adapters.Cowboy.http __MODULE__, []
+    startHttp?(Application.get_env(:kolab_wopi, :http))
+    startHttps?(Application.get_env(:kolab_wopi, :https))
   end
 
+
+  defp startHttp?(:nil) do
+    :no
+  end
+
+  defp startHttp?(http_config) do
+    Plug.Adapters.Cowboy.http  __MODULE__, [], http_config
+  end
+
+
+  defp startHttps?(:nil) do
+    :no
+  end
+
+  defp startHttps?(https_config) do
+    Plug.Adapters.Cowboy.https __MODULE__, [], https_config
+  end
+
+
   forward "/wopi/files",       to: __MODULE__.Files
   forward "/wopi/containers",  to: __MODULE__.Containers
   forward "/wopi/ecosystem",   to: __MODULE__.Ecosystem