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diff --git a/lib/pleroma/web/fallback/legacy_pleroma_api_rerouter_plug.ex b/lib/pleroma/web/fallback/legacy_pleroma_api_rerouter_plug.ex
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+++ b/lib/pleroma/web/fallback/legacy_pleroma_api_rerouter_plug.ex
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+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.Fallback.LegacyPleromaApiRerouterPlug do
+  alias Pleroma.Web.Endpoint
+  alias Pleroma.Web.Fallback.RedirectController
+
+  def init(opts), do: opts
+
+  def call(%{path_info: ["api", "pleroma" | path_info_rest]} = conn, _opts) do
+    new_path_info = ["api", "v1", "pleroma" | path_info_rest]
+    new_request_path = Enum.join(new_path_info, "/")
+
+    conn
+    |> Map.merge(%{
+      path_info: new_path_info,
+      request_path: new_request_path
+    })
+    |> Endpoint.call(conn.params)
+  end
+
+  def call(conn, _opts) do
+    RedirectController.api_not_implemented(conn, %{})
+  end
+end