callerResolver

The rehearsal's driver names the tenant it acts in, and the owner a created order or cart belongs to, as the 9.x routes named them in their paths: X-Rehearsal-Tenant and X-Rehearsal-Owner. A request without the tenant is the default tenant's. A caller without an owner is tenant-level: it reaches every order of its tenant, as the 9.x routes of an order did. X-Rehearsal-Region gives the caller the claim REGION, whose orders alone it reaches (orderAccess).