# File lib/rack/handler/webrick.rb, line 25
      def self.run(app, options={})
        environment  = ENV['RACK_ENV'] || 'development'
        default_host = environment == 'development' ? 'localhost' : '0.0.0.0'

        options[:BindAddress] = options.delete(:Host) || default_host
        options[:Port] ||= 8080
        options[:OutputBufferSize] = 5
        @server = ::WEBrick::HTTPServer.new(options)
        @server.mount "/", Rack::Handler::WEBrick, app
        yield @server  if block_given?
        @server.start
      end