New Provisioning UI: 401 Error when creating a new requisition

Adding a new requisition fails with:

• Failed to load resource: the server responded with a status of 401 (Full authentication is required to access this resource)
• addRequisition: POST /opennms/rest/requisitions failed: 0

Inspecting the HTTP requests reveals the following:

1. POST to http://127.0.0.1:8980/opennms/rest/requisitions returns a 303 with Location: http://localhost:8980/opennms/rest/requisitions/NODES
2. GET to http://localhost:8980/opennms/rest/requisitions/NODES returns a 401

In the requests above, the hostname returned in the location header differs, so the existing cookies aren't used, and authentication fails.