title: How to avoid Windows (Vista) to do "double" webdav requests
body: <p>We use DIGEST authentication for our WebDAV Access. We observe that Windows clients send each request twice. First request doesn't have <code>Authorization</code> header (and gets 401 response), second request has <code>Authorization</code> header (and usually gets correct response).</p>
  
  <p>While user probably cannot see this, it makes whole Webdav access slower then necessary.</p>
  
  <p>Is it possible to avoid this behaviour somehow? Maybe some special response which will convince Windows not to do this? When we use BASIC instead of DIGEST, it works fine (doing single request only with <code>Authorization</code> header always included)</p>