If request matches a static resource, returns it in a response map.
Otherwise returns nil. See wrap-resource for the available options.

Middleware that first checks to see whether the request map matches a static
resource. If it does, the resource is returned in a response map, otherwise
the request map is passed onto the handler. The root-path argument will be
added to the beginning of the resource path.

Accepts the following options:

:loader          - resolve the resource using this class loader
:allow-symlinks? - allow symlinks that lead to paths outside the root
                   classpath directories (defaults to false)
:prefer-handler? - prioritize handler response over resources (defaults to
                   false)