code: function(proxies, namespace, serverType, proxy) {
    proxies[namespace] = proxies[namespace] || {};
    if (proxies[namespace][serverType]) {
      for (let attr in proxy) {
        proxies[namespace][serverType][attr] = proxy[attr];
      }
    } else {
      proxies[namespace][serverType] = proxy;
    }
  }
docs: Add proxy into array.
  
  @param proxies {Object} rpc proxies
  @param namespace {String} rpc namespace sys/user
  @param serverType {String} rpc remote server type
  @param proxy {Object} rpc proxy
  
  @api private