Verify `server` header
https://jira.usit.uio.no/browse/BOTTINT-47
DFØ SAP API sets the Server
HTTP header. It is less likely we misinterpret the response when we verify this header. Esp. 404
responses are problematic. If we blindly trust a 404
to mean "Resource not found", a configuration error or an error in the API manager may be misinterpreted as "This person doesn't have any permisjoner" instead of throwing an exception.
Edited by Trond Aasan