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There are gems/libraries that would benefit from better control over where they inject their middleware.
In particular it would be nice if exception-handling middleware were at the top of the stack.
Is there any way to do this, or can it only be done by editing config.ru?
There is currently no intrinsic way to do this other than manually ordering the middleware stack. I’ve seen a hack where you could monkey patch Rack::Builder to provide you with some push/pop capabilities.
https://github.com/joshbuddy/rack-capabilities