/**
  * Gets the HTTP headers for the report download request.
  * @param AdWordsUser $user the AdWordsUser to get credentials from
  * @param string $url the URL the request will be made to
  * @param array $options the options for the download
  * @return array and array of strings, which are header names and values
  */
 private static function GetHeaders($user, $url, array $options = null)
 {
     $headers = array();
     $version = !empty($options['version']) ? $options['version'] : $user->GetDefaultVersion();
     // Authorization.
     $authHeader = null;
     $oAuth2Info = $user->GetOAuth2Info();
     $oAuth2Handler = $user->GetOAuth2Handler();
     if (!empty($oAuth2Info)) {
         $oAuth2Info = $oAuth2Handler->GetOrRefreshAccessToken($oAuth2Info);
         $user->SetOAuth2Info($oAuth2Info);
         $authHeader = $oAuth2Handler->FormatCredentialsForHeader($oAuth2Info);
     } else {
         throw new ServiceException('OAuth 2.0 authentication is required.');
     }
     $headers['Authorization'] = $authHeader;
     // Developer token.
     $headers['developerToken'] = $user->GetDeveloperToken();
     // Target client.
     $clientCustomerId = $user->GetClientCustomerId();
     if (isset($clientCustomerId)) {
         $headers['clientCustomerId'] = $clientCustomerId;
     } else {
         throw new ReportDownloadException('The client customer ID must be ' . 'specified for report downloads.');
     }
     // Flags.
     if (isset($options['skipReportHeader'])) {
         $headers['skipReportHeader'] = $options['skipReportHeader'] ? 'true' : 'false';
     }
     if (isset($options['skipColumnHeader'])) {
         DeprecationUtils::CheckUsingReportHeadersWithUnsupportedVersion('skipColumnHeader', self::MINIMUM_SKIP_COLUMN_HEADER_VERSION, $version);
         $headers['skipColumnHeader'] = $options['skipColumnHeader'] ? 'true' : 'false';
     }
     if (isset($options['skipReportSummary'])) {
         $headers['skipReportSummary'] = $options['skipReportSummary'] ? 'true' : 'false';
     }
     if (isset($options['includeZeroImpressions'])) {
         DeprecationUtils::CheckUsingReportHeadersWithUnsupportedVersion('includeZeroImpressions', self::MINIMUM_INCLUDE_ZERO_IMPRESSIONS_HEADER_VERSION, $version);
         $headers['includeZeroImpressions'] = $options['includeZeroImpressions'] ? 'true' : 'false';
     }
     return $headers;
 }
 /**
  * @expectedException ServiceException
  */
 public function testCheckUsingIncludeZeroImpressionsHeaderWithUnsupportedVersion()
 {
     $this->setExpectedException('ServiceException');
     DeprecationUtils::CheckUsingReportHeadersWithUnsupportedVersion('includeZeroImpressions', 'v201506', 'v201502');
 }