One way to improve Web performance and reliability is to replicate popular Web resources among different servers. If one of the servers fails, clients satisfy their requests from other servers that contain replicas of the same resource. Client requests can be directed to the ``closest'' server that contains the requested resource and thereby improve the request response time. Replication also allows the balancing of clients' requests among different servers and enables ``cost-conscious scalability'' [9,42] of the Web service whereby a surge in a server load can be handled by dynamically replicating hot data on additional servers. In this paper we present an overview of design of our Web++ system for replication of the HTTP service. Unlike other similar systems reported in literature, Web++ is completely transparent to the browser user and requires no changes to the existing Web infrastructure. Web++ clients are downloaded as cryptographically signed applets to commercially available browsers. There is no need for end-users to install a plug-in or client-side proxy. There is no need for any modification of the browser; the Web++ applet can execute in both Netscape Navigator 4.x and Microsoft Explorer 4.x browsers. Web servers that support servlets can be directly extended with Web++ servlets. Other servers are extended with a server-side proxy that supports servlets. All client-to-server and server-to-server communication is carried on top of HTTP 1.1. Other salient features of Web++ are: