Example of ResqueWeb for RoR 2.3

resque_web.rb

class ResqueWeb

  def initialize(app)
    @app = app
  end

  def call(env)
    if env['PATH_INFO'].include? '/resque'
      resque_web = Rack::Builder.new {
        map "/resque" do
          use Rack::Auth::Basic, "Resque" do |user, password|
            user == 'xxxx' && password == 'xxxx'
          end
          run Resque::Server.new
        end
      }.to_app

      resque_web.call env
    else
      @app.call env
    end
  end

end

Rails.configuration.middleware.use 'ResqueWeb'