class Middleman::Rack

def send_file(resource, env)
  file     = ::Rack::Files.new nil
  path     = resource.file_descriptor[:full_path].to_s
  if !file.respond_to?(:path=)
    request  = ::Rack::Request.new(env)
    response = file.serving(request, path)
  else
    file.path = path
    response = file.serving(env)
  end
  status = response[0]
  response[1]['content-encoding'] = 'gzip' if %w(.svgz .gz).include?(resource.ext)
  # Do not set content-type if status is 1xx, 204, 205 or 304, otherwise
  # Rack will throw an error (500)
  if !(100..199).cover?(status) && ![204, 205, 304].include?(status)
    response[1]['content-type'] = resource.content_type || 'application/octet-stream'
  end
  halt response
end