class ActionDispatch::FileHandler

def initialize(root, index: "index", headers: {}, precompressed: %i[ br gzip ], compressible_content_types: /\A(?:text\/|application\/javascript)/)
  @root = root.chomp("/").b
  @index = index
  @precompressed = Array(precompressed).map(&:to_s) | %w[ identity ]
  @compressible_content_types = compressible_content_types
  @file_server = ::Rack::Files.new(@root, headers)
end