Rooneg: What does it do? In short, it allows you to only send new entries in your Atom feeds down to the clients. The client program adds a few HTTP headers (a If-Modified-Since to tell you what the last time they got was and an A-IM that indicates you support the 'feed' IM) and things just magically work.
Source: Sam Ruby.
Randy: This is RFC3229 support for Apache. Read Rooneg's original article and don't forget Sam's follow on. Further, Bob Wyman has been preaching 3229 on his blog. The only problem w/ 3229 is that it's not widely used by any HTTP clients and from what I know, it's not used by any RSS readers.
Most RSS clients don't support Etags and gzip. I'd prefer they get the basics done first before they move onto something new. I think it's time I setup a test to confirm, who supports what.
Randy
Well, if _Most_ is 50% or higher, then the answer is "I think so, but I'm not sure." So, let's test this out.
Randy