public async Task ReadNotExistingChapterAsync() { Console.WriteLine(nameof(ReadNotExistingChapterAsync)); string requestedIdentifier = Guid.NewGuid().ToString(); try { BookChapter chapter = await _client.GetAsync( _urlService.BooksApi + requestedIdentifier.ToString()); Console.WriteLine($"{chapter.Number} {chapter.Title}"); } catch (HttpRequestException ex) when (ex.Message.Contains("404")) { Console.WriteLine($"book chapter with the identifier " + $"{requestedIdentifier} not found"); } Console.WriteLine(); }