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PROPFIND /dav/addressbook/ HTTP/1.1
Brief: t
Content-Type: text/xml
Depth: 1
Prefer: return=minimal

<?xml version="1.0" encoding="UTF-8"?>
<A:propfind xmlns:A="DAV:">
  <A:prop>
    <A:getetag/>
  </A:prop>
</A:propfind>