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Layer traits and extensions.

A layer decorates an service and provides additional functionality. It allows other services to be composed with the service that implements layer.

A middleware implements the Layer and Service trait.


A no-op middleware.
A Layer implemented by a closure. See the docs for layer_fn for more details.
Two middlewares chained together.


Decorates a Service, transforming either the request or the response.


Returns a new LayerFn that implements Layer by calling the given function.