A reverse proxy is the correct answer because it is designed to retrieve resources on behalf of a client from one or more servers. These resources are then returned to the client, appearing as if they originated from the proxy server itself. This setup is commonly used to provide a central point of control and to protect web servers from direct access.

Gateways and load balancers, while they can provide aspects of traffic management and routing, do not typically provide direct access controls or presentation alterations to web content being accessed. Firewalls can restrict access but are not designed specifically for acting as an intermediary for web application traffic and typically do not provide content accessibility and control at the application level.