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Could not resolve host: sitemap.xml

array (
  'ok' => 0,
  'error' => 'curl_error',
  'code' => 0,
  'curl_errno' => 6,
  'curl_error' => 'Could not resolve host: sitemap.xml',
  'method' => '',
  'url' => 'http://sitemap.xml/',
  'info' => 
  array (
    'url' => 'http://sitemap.xml/',
    'content_type' => NULL,
    'http_code' => 0,
    'header_size' => 0,
    'request_size' => 0,
    'filetime' => -1,
    'ssl_verify_result' => 0,
    'redirect_count' => 0,
    'total_time' => 0.008468,
    'namelookup_time' => 0.0,
    'connect_time' => 0.0,
    'pretransfer_time' => 0.0,
    'size_upload' => 0.0,
    'size_download' => 0.0,
    'speed_download' => 0.0,
    'speed_upload' => 0.0,
    'download_content_length' => -1.0,
    'upload_content_length' => -1.0,
    'starttransfer_time' => 0.0,
    'redirect_time' => 0.0,
    'redirect_url' => '',
    'primary_ip' => '',
    'certinfo' => 
    array (
    ),
    'primary_port' => 0,
    'local_ip' => '',
    'local_port' => 0,
    'http_version' => 0,
    'protocol' => 0,
    'ssl_verifyresult' => 0,
    'scheme' => '',
    'appconnect_time_us' => 0,
    'connect_time_us' => 0,
    'namelookup_time_us' => 0,
    'pretransfer_time_us' => 0,
    'redirect_time_us' => 0,
    'starttransfer_time_us' => 0,
    'total_time_us' => 8468,
    'effective_method' => 'GET',
    'capath' => '/etc/ssl/certs',
    'cainfo' => '/etc/ssl/certs/ca-certificates.crt',
    'curl_error_code' => 6,
    'curl_error_msg' => 'Could not resolve host: sitemap.xml',
  ),
  'req_headers' => 
  array (
    '_request' => '',
  ),
  'headers' => 
  array (
    '_status' => '',
  ),
  'rsp_len' => 0,
  'req_url' => 'http://sitemap.xml/',
  'total_ms' => 11,
)