class Puma::Rack::Options

def handler_opts(options)
  begin
    info = []
    server = Rack::Handler.get(options[:server]) || Rack::Handler.default(options)
    if 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 << "  -O %-21s %s" % [name, description]
        has_options = true
      end
      return "" if !has_options
    end
    info.join("\n")
  rescue NameError
    return "Warning: Could not find handler specified (#{options[:server] || 'default'}) to determine handler-specific options"
  end
end