ImplicitHeadMiddleware

This middleware adds implicit support for HEAD requests because the HTTP spec requires servers to support both GET and HEAD methods:

The methods GET and HEAD MUST be supported by all general-purpose servers

By default, Borsch Framework uses a nikic/FastRoute implementation router which already deals with HEAD requests (see here on nikic/FastRoute page).
Therefore, this middleware is not really useful because it will never be needed as FastRoute already deals with it.
The middleware is present in the case you decide to implement your own RouterInterface, so that if it does not deal with HEAD requests, the middleware will do it instead.

info

It is recommended to keep this middleware in the pipeline, even with the default Borsch Router.