<?xml version="1.0" encoding="utf-8"?>
<d:error xmlns:d="DAV:" xmlns:s="http://sabredav.org/ns">
  <s:exception>NotAuthenticated</s:exception>
  <s:message>No 'Authorization: Basic' header found. Either the client didn't send one, or the server is misconfigured</s:message>
</d:error>