HTTP 1.1 pipelining

[S. Mike Dierken]

I'm looking into request pipelining & had a question about the kind of requests allowed. The RFC says only idempotent requests should be pipelined. This FAQ (http://www.mozilla.org/projects/netlib/http/pipelining-faq.html) from Mozilla says PUT should not be used because it isn't idempotent. Except that it is. PUT is idempotent (repeatable with deterministic results).   Which is it?