The Sterling Selling and Fulfillment Foundation HTTP screens are stateful, in the sense that a screen preserves state information for subsequent screens. As a result, you have to set up proxy servers or load-balancers to load-balance HTTP requests with a “sticky” load-balancing policy. This ensures HTTP requests go back to the server that have the session states.
Load-balancing can improve performance for large number of HTTP users because the user population is serviced by multiple application servers that are managed as a cluster. Load-balancing can be implemented with a variety of technologies ranging from the Apache proxy servers to hardware-based load balancers.
Sterling Selling and Fulfillment Foundation supports HTTP in-memory session replication in the following configuration: