## Client identification (ET-Client-Name)
Every Entur API — open and partner — requires your application to identify itself using the `ET-Client-Name` header. This is always the first step, regardless of which service type you are using.
This helps Entur understand how its APIs are used and allows traffic to be managed responsibly. Requests without this header may be rate limited or blocked.
Use a value that uniquely identifies your company and application, in the form `