class ActiveStorage::Blobs::ProxyController

def show
  if request.headers["Range"].present?
    send_blob_byte_range_data @blob, request.headers["Range"]
  else
    http_cache_forever public: true do
      response.headers["Accept-Ranges"] = "bytes"
      response.headers["Content-Length"] = @blob.byte_size.to_s
      send_blob_stream @blob, disposition: params[:disposition]
    end
  end
end