class Rackup::Server::Options

def handler_opts(options)
  info = []
  server = Rackup::Handler.get(options[:server]) || Rackup::Handler.default
  if server && server.respond_to?(:valid_options)
    info << ""
    info << "Server-specific options for #{server.name}:"
    has_options = false
    server.valid_options.each do |name, description|
      next if /^(Host|Port)[^a-zA-Z]/.match?(name.to_s) # ignore handler's host and port options, we do our own.
      info << sprintf("  -O %-21s %s", name, description)
      has_options = true
    end
    return "" if !has_options
  end
  info.join("\n")
rescue NameError, LoadError
  return "Warning: Could not find handler specified (#{options[:server] || 'default'}) to determine handler-specific options"
end