Using RFC3229 with Feeds Does Not Validate
In an effort to cut down on the bandwidth used by RSS feeds, Subtext implements the RFC3229 for feeds as proposed by Bob Wyman.
Unfortunately, FeedValidator.org now says
my feed is not valid. The reason is that
Feed Validator assumes that the HTTP Status code of
226 IM Used is an
error. Perhaps it does not yet recognize RFC3229.