gistfile1.cs

  public string GetCanonicalizedHeaders(HttpWebRequest request)
  {
      ArrayList headerNameList = new ArrayList();
      StringBuilder sb = new StringBuilder();
      foreach (string headerName in request.Headers.Keys)
      {
          if (headerName.ToLowerInvariant().StartsWith("x-ms-", StringComparison.Ordinal))
          {
              headerNameList.Add(headerName.ToLowerInvariant());
          }
      }
      headerNameList.Sort();
      foreach (string headerName in headerNameList)
      {
          StringBuilder builder = new StringBuilder(headerName);
          string separator = ":";
          foreach (string headerValue in GetHeaderValues(request.Headers, headerName))
          {
              string trimmedValue = headerValue.Replace("\r\n", String.Empty);
              builder.Append(separator);
              builder.Append(trimmedValue);
              separator = ",";
          }
          sb.Append(builder.ToString());
          sb.Append("\n");
      }
      return sb.ToString();
  }

gistfile2.cs

private string GetCanonicalizedHeaders(HttpClient httpClient)
{
    var stringBuilder = new StringBuilder();
    
    foreach (var header in httpClient.DefaultRequestHeaders
        .Where(x => x.Key.StartsWith("x-ms-", StringComparison.InvariantCultureIgnoreCase))
        .OrderBy(x => x.Key)
    )
    {
        var builder = new StringBuilder(header.Key);
        var separator = ":";

        foreach (var trimmedValue in header.Value.Select(headerValue => headerValue.Replace("\r\n", string.Empty)))
        {
            builder.Append(string.Format("{0}{1}", separator, trimmedValue));
            separator = ",";
        }

        stringBuilder.Append(builder);
        stringBuilder.Append("\n");
    }

    return stringBuilder.ToString();
}