What is Rack middleware?

What is Rack middleware?

ruby-on-rails ruby http web-applications rack

ruby

Recurring billing with Rails and ActiveMerchant: Best practices, pitfalls, gotchas?

ruby-on-rails ruby web-applications payment recurring-billing

ruby

In Sinatra(Ruby), how should I create global variables which are assigned values only once in the application lifetime?

ruby web-applications sinatra

ruby

Is it possible to build a production web application using MagLev for ruby? [closed]

ruby web-applications maglev

ruby

Alternatives to php for in-line web programming?

php python ruby web-applications

ruby

Have radio button's label make selection too?

html ruby-on-rails ruby web-applications

ruby

Creating a web app in Ruby without a framework [closed]

ruby web-applications

ruby