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diff --git a/lib/pleroma/web/plugs/set_format_plug.ex b/lib/pleroma/web/plugs/set_format_plug.ex
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+++ b/lib/pleroma/web/plugs/set_format_plug.ex
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+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2022 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.Plugs.SetFormatPlug do
+  import Plug.Conn, only: [assign: 3, fetch_query_params: 1]
+
+  def init(_), do: nil
+
+  def call(conn, _) do
+    case get_format(conn) do
+      nil -> conn
+      format -> assign(conn, :format, format)
+    end
+  end
+
+  defp get_format(conn) do
+    conn.private[:phoenix_format] ||
+      case fetch_query_params(conn) do
+        %{query_params: %{"_format" => format}} -> format
+        _ -> nil
+      end
+  end
+end