CalDavSynchronizer.DataAccess.WebDavDataAccess.HasOption C# (CSharp) Method

    protected async Task<bool> HasOption (string requiredOption)
    {
      IHttpHeaders headers;
      try
      {

        headers = await _webDavClient.ExecuteWebDavRequestAndReturnResponseHeaders(
          _serverUrl,
          "OPTIONS",
          null,
          null,
          null,
          null,
          null);
      }
      catch (WebDavClientException x) when (x.StatusCode == HttpStatusCode.NotFound)
      {
        // iCloud and Google CardDav return with 404 and OPTIONS doesn't work for the resource uri
        return true;
      }
      IEnumerable<string> davValues;
      if (headers.TryGetValues ("DAV", out davValues))
      {
        return davValues.Any (
            value => value.Split (new[] { ',' })
                .Select (o => o.Trim())
                .Any (option => String.Compare (option, requiredOption, StringComparison.OrdinalIgnoreCase) == 0));
      }
      else
      {
        return false;
      }
    }