module Middleman::CoreExtensions::Request::InstanceMethods

def send_file(path, env, res)
  extension = File.extname(path)
  matched_mime = mime_type(extension)
  matched_mime = "application/octet-stream" if matched_mime.nil?
  content_type res, matched_mime
  file      = ::Rack::File.new nil
  file.path = path
  response = file.serving(env)
  response[1]['Content-Encoding'] = 'gzip' if %w(.svgz).include?(extension)
  halt response
end