The ReST API allows you to poll for the status of
certain operations by performing a GET on various
elements. Rather than re-downloading and re-parsing
the full status at each polling interval, your ReST
client may use the
changes-since parameter to
check for changes since a previous request. The
changes-since time is
specified as Unix time (the number of seconds since
January 1, 1970, 00:00:00 UTC, not counting leap
seconds). If nothing has changed since the
changes-since time, a
304 (Not Modified)
response will be returned. If data has changed, only
the items changed since the specified time will be
returned in the response. For example, performing a
GET against
https://api.servers.rackspacecloud.com/v1.0/224532/servers?changes-since=1244012982
would list all servers that have changed since Wed, 03
Jun 2009 07:09:42 UTC.
