abstract fun resolveResource(@Nullable exchange: ServerWebExchange, requestPath: String, locations: MutableList<out Resource>): Mono<Resource>
Resolve the supplied request and request path to a Resource that exists under one of the given resource locations.
exchange - the current exchange
requestPath - the portion of the request path to use
locations - the locations to search in when looking up resources
Return
the resolved resource; or an empty Mono if unresolved