docs: @VisibleForTesting
    protected void initializeHttpRpcPlugins(final OperationMode mode,
          final String[] pluginClassNames,
          final ImmutableMap.Builder<String, HttpRpcPlugin> http) {
      for (final String plugin : pluginClassNames) {
        final HttpRpcPlugin rpc = createAndInitialize(plugin, HttpRpcPlugin.class);
        validateHttpRpcPluginPath(rpc.getPath());
        final String path = rpc.getPath().trim();
        final String canonicalized_path = canonicalizePluginPath(path);
        http.put(canonicalized_path, rpc);
        LOG.info("Mounted HttpRpcPlugin [{}] at path \"{}\"", rpc.getClass().getName(), canonicalized_path);
      }
    }