A little router

config.ru

class Router
  def initialize
    @route_list = {:get => {}, :post => {}, :put => {}, :delete => {}}
  end

  def add_route(method, route, &blk)
    @route_list[method][route] = blk
  end

  def call(env)
    begin
      method = env["REQUEST_METHOD"].downcase.to_sym
      route = env["PATH_INFO"]
      content = @route_list[method][route].call
      return [200, {"Content-Type" => "text/html"}, [content]]
    rescue Exception => e
      return [404, {"Content-Type" => "text/html"}, ["Not Found"]]
    end
  end
end

router = Router.new

router.add_route(:get, "/hello") do
  "hello world!"
end

run router