code: public @Nonnull  Optional<ResourceLoader> getSupportingLoader(@Nonnull String prefix) {
          ArgumentUtils.requireNonNull("prefix", prefix);
          return resourceLoaders.stream()
              .filter(rl -> rl.supportsPrefix(prefix))
              .findFirst();
      }
docs: Searches resource loaders for one that supports the given prefix.
  
  @param prefix The prefix the loader should support. (classpath:, file:, etc)
  @return An optional resource loader