private static async Task LogContentAsync(StringBuilder log, HttpContent httpContent)
        {
            if (httpContent != null)
            {
                log.AppendLine("    CONTENT HEADERS: ");

                LogHeaders(log, httpContent.Headers);

                if (httpContent.IsPlainText()
                    || httpContent.IsHtmlText()
                    || httpContent.IsJson()
                    || httpContent.IsFormUrlEncoded())
                {
                    var content = await httpContent.ReadAsStringAsync();

                    StorageFolder folder = null;

                    try
                    {
                        folder = (await ApplicationData.Current.LocalFolder.GetFoldersAsync())
                            .FirstOrDefault(x => string.Equals(x.Name, WebResponseLogs, StringComparison.OrdinalIgnoreCase));
                    }
                    catch (InvalidOperationException)
                    {
                        // Unit tests does not have package identity. We just ignore them.
                    }

                    if (folder != null)
                    {
                        var fileName = string.Format("{0}.log", Guid.NewGuid());
                        var file = await folder.CreateFileAsync(fileName);
                        await FileIO.WriteTextAsync(file, content);
                        log.AppendFormat("    CONTENT FILE: {0}", file.Path);
                    }
                    else
                    {
                        log.AppendFormat("    CONTENT:{0}{1}", Environment.NewLine, content.Substring(0, Math.Min(4096, content.Length)));
                        log.AppendLine();
                        log.AppendFormat("    ENDCONTENT.");
                        log.AppendLine();
                    }
                }
            }
            else
            {
                log.AppendLine("    CONTENT IS NULL.");
            }
        }