A front-end development team requires data from a service that is yet to be implemented. As the lead on inter-service communications, you need to configure your gateway to provide static responses to continue front-end development. Which technique would allow you to achieve this without relying on the service logic itself?
Applying request validation on the incoming requests to the interface.
Implementing a temporary version of the service logic that produces static data.
Setting up a mock integration directly on the gateway to mimic expected responses.
Enabling cross-origin resource sharing (CORS) at the interface.