public async Task Invoke(HttpContext context)
{
  try
  {
    await this.next(context);
  }
  catch (Exception ex)
  {
    await HandleExceptionAsync(context, ex);
  }
}

private async Task HandleExceptionAsync(HttpContext context, Exception exception)
{
  // Populate ExceptionLogEntry...
  // Write a new error entry in the logs...
  // Return a clean HTTP 500 response to the client...
}