+ headers
+ |> downcase_headers()
+ |> Enum.filter(fn {k, _} -> k in @keep_req_headers end)
+ |> build_req_range_or_encoding_header(opts)
+ |> build_req_user_agent_header(opts)
+ |> Keyword.merge(Keyword.get(opts, :req_headers, []))
+ end
+
+ # Disable content-encoding if any @range_headers are requested (see #1823).
+ defp build_req_range_or_encoding_header(headers, _opts) do
+ range? = Enum.any?(headers, fn {header, _} -> Enum.member?(@range_headers, header) end)
+
+ if range? && List.keymember?(headers, "accept-encoding", 0) do
+ List.keydelete(headers, "accept-encoding", 0)
+ else
+ headers
+ end
+ end
+
+ defp build_req_user_agent_header(headers, opts) do
+ if Keyword.get(opts, :keep_user_agent, false) do
+ List.keystore(
+ headers,
+ "user-agent",
+ 0,
+ {"user-agent", Pleroma.Application.user_agent()}
+ )
+ else