Rack::Current

Sometimes, in the course of human events, you need to access the currently executing http request, and you don't always have the luxury of passing it around, especially when you're working with frameworks that manage the lifecycle of objects for you, or you want to include functionality from a module. That module might not have a clean way of getting a reference to the request object.

CurrentRequest stores the current request in a thread local so that you can access it from anywhere inside the request stack.

Not really. There are certain objects whose natural scope is the lifetime of an http request. The http request object itself is one such object. As long as the thread is the fundamental unit of concurrency in your server, you'll be ok.

That said, you should ensure that you are in fact including this into methods that will be invoked inside the request stack, and not, say, like a background job (like sending email) that is fired off during the course of a request.

    class Foo
      include Rack::Curent

      def current_url
        "#{current_request.protocol}://#{current_request.host}/#{current_request.path}
      end
    end

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