Web API options are managed here.
WebApi
Enabled/Disable Web API interface.
Enforce SSL
Select to enforce HTTPS connection. (Highly recommended)
Service not available message
If Web API is disabled, Service Unavailable (503) status code will be returned with this custom message.
Controllers
Enable/disable specific controller (Status column) or specific set of action methods (GET, POST, PUT, DELETE) for appropriate controller.
Logging
Web API logging options are managed here.