internal void ParseLinkHeader(HttpResponseMessage response, System.Uri requestUri)
{
    if (_relationLink == null)
    {
        // Must ignore the case of relation links. See RFC 8288 (https://tools.ietf.org/html/rfc8288)
        _relationLink = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);
    }
    else
    {
        _relationLink.Clear();
    }

    // we only support the URL in angle brackets and `rel`, other attributes are ignored
    // user can still parse it themselves via the Headers property
    const string pattern = "<(?<url>.*?)>;\\s*rel=(?<quoted>\")?(?<rel>(?(quoted).*?|[^,;]*))(?(quoted)\")";
    IEnumerable<string> links;
    if (response.Headers.TryGetValues("Link", out links))
    {
        foreach (string linkHeader in links)
        {
            MatchCollection matchCollection = Regex.Matches(link, pattern)
            foreach (Match match in matchCollection)
            {
                if (match.Success)
                {
                    string url = match.Groups["url"].Value;
                    string rel = match.Groups["rel"].Value;
                    if (url != string.Empty && rel != string.Empty && !_relationLink.ContainsKey(rel))
                    {
                        Uri absoluteUri = new(requestUri, url);
                        _relationLink.Add(rel, absoluteUri.AbsoluteUri);
                    }
                }
            }
        }
    }
}