The HTTP status code that was returned by the web server when the feed was fetched.
If the feed was redirected from its original URL,
status will contain the redirect status code, not the final status
301, the feed was permanently redirected to a new
URL. Clients should update their address
book to request the new URL from now on.
410, the feed is gone. Clients should stop polling the
status will only be present if the feed was retrieved from a web
server. If the feed was parsed from a local file or from a string in memory,
status will not be present.