'_previous' => bless( {
                                                                                                              '_protocol' => 'HTTP/1.1',
                                                                                                              '_content' => '

  Sabre\\DAV\\Exception\\NotAuthenticated
  No basic authentication headers were found
  1.8.7

',
                                                                                                              '_rc' => '401',
                                                                                                              '_headers' => bless( {
                                                                                                                                     'connection' => 'close',