Cloud applications need to be protected from malicious users. Also, some cloud applications are provided by multiple cloud service providers. Users are therefore in a position to choose one service provider according to his or her terms. Cloud broker is a new software product enabling users to zero down the appropriate cloud service providers. Thus, a kind of gatekeeper software solution is needed to act as a broker between application clients and application services, validate and sanitize requests, and pass requests and data between them. This can provide an additional layer of security, and limit the attack surface of the system.

This pattern minimizes the risk of clients gaining access to sensitive information and services. This gateway solution contributes as a façade or a dedicated task that interacts with clients and then hands off the request perhaps through a decoupled interface to the hosts or tasks that'll handle the request.