[wenbin]

If there's redirect, then we use the final destination url, e.g., http://feeds.podtrac.com/fRt6e7vOZ-19 redirects to civilbeat.org..., so we use civilbeat.org

If there's not redirect, then we use the exact url, e.g., http://feeds.podtrac.com/nice-peter doesn't redirect, then it's podtrac.com