module Qeweney::ResponseMethods

def serve_file(path, opts = {})
  full_path = file_full_path(path, opts)
  stat = File.stat(full_path)
  etag = StaticFileCaching.file_stat_to_etag(stat)
  last_modified = StaticFileCaching.file_stat_to_last_modified(stat)
  if validate_static_file_cache(etag, last_modified)
    return respond(nil, {
      ':status' => Status::NOT_MODIFIED,
      'etag' => etag
    })
  end
  mime_type = Qeweney::MimeTypes[File.extname(path)]
  opts[:stat] = stat
  (opts[:headers] ||= {})['Content-Type'] ||= mime_type if mime_type
  respond_with_static_file(full_path, etag, last_modified, opts)
rescue Errno::ENOENT
  respond(nil, ':status' => Status::NOT_FOUND)
end