code: function insertProxy(proxies, namespace, serverType, proxy) {
      proxies[namespace] = proxies[namespace] || {};
      if (proxies[namespace][serverType]) {
          for (const attr in proxy) {
              if (proxy.hasOwnProperty(attr)) {
                  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