protected function queueRequests( $urls ) {
		$this->curlQueue = [];
		if ( $this->queuedTesting === false ) {
			$this->curlQueue[] = $urls;

			return;
		}
		foreach ( $urls as $url ) {
			$domain = $this->parseURL( $url )['host'];
			$queuedUrl = false;
			$queueIndex = -1;
			foreach ( $this->curlQueue as $queueIndex => $urlList ) {
				if ( $queuedUrl === false && !isset( $urlList[$domain] ) ) {
					$this->curlQueue[$queueIndex][$domain] = $url;
					$queuedUrl = true;
				}
			}
			if ( $queuedUrl === false ) {
				$this->curlQueue[++$queueIndex][$domain] = $url;
			}
		}
	}