Use case: I want to register the server with a service discovery mechanism at startup. The additional functionality involved is well-suited to middleware, and the registration is currently implemented in the middleware's initialize method.

With rackup the middleware is initialized upon server startup.

With Sinatra's use, either at top-level or inside a Sinatra::Base, the middleware is only initialized after the first request is received:

It would be useful if Sinatra had same behavior as rackup, initializing all middleware at server startup.

Sinatra: 1.4.7
Rack: 1.6.4