gistfile1.rb

module Rack
  class Lockdown

    def initialize(app)
      @app = app
    end
    
    def call(env)
      request = Rack::Request.new(env)
      if ["GET", "HEAD"].include?(request.request_method)
        @app.call(env)
      else
        message = "That action is currently not supported."
        message << " We apologize for any inconvenience."
        [405, {"Content-Type" => "text/html"}, message]
      end
    end

  end
end