Support redirecting by object ID in static FE.

This matches the behavior of pleroma-fe better.

Fixes #1412.

test/web/static_fe/static_fe_controller_test.exs

@@ -1,5 +1,6 @@
 defmodule Pleroma.Web.StaticFE.StaticFEControllerTest do
   use Pleroma.Web.ConnCase
+  alias Pleroma.Activity
   alias Pleroma.Web.ActivityPub.Transmogrifier
   alias Pleroma.Web.CommonAPI
 
@@ -128,6 +129,20 @@ defmodule Pleroma.Web.StaticFE.StaticFEControllerTest do
       assert html =~ "voyages"
     end
 
+    test "redirect by AP object ID", %{conn: conn} do
+      user = insert(:user)
+
+      {:ok, %Activity{data: %{"object" => object_url}}} =
+        CommonAPI.post(user, %{"status" => "beam me up"})
+
+      conn =
+        conn
+        |> put_req_header("accept", "text/html")
+        |> get(URI.parse(object_url).path)
+
+      assert html_response(conn, 302) =~ "redirected"
+    end
+
     test "404 when notice not found", %{conn: conn} do
       conn =
         conn