I do not think one can say what the Content-Disposition of a multipart/*
body part should be.  From RFC 2183:

   If a Content-Disposition header is used on a multipart body part, it
   applies to the multipart as a whole, not the individual subparts.
   The disposition types of the subparts do not need to be consulted
   until the multipart itself is presented. When the multipart is
   displayed, then the dispositions of the subparts should be respected.


We already have a compatible-with-MIME solution.  Mark the
Content-Disposition of the multipart/* as render, session, or inline with
the needed handling parameter, and have the Content-Disposition of the
sub-parts be whatever they really need to be (if not render).  The logic is
simply to say what you mean.  It really is just a suggestion.  If we are
talking about a multipart/alternative describing sessions, then the
Content-Disposition should be session.  Of course, you could have
Content-Disposition be foobar (or, better yet, inline), so long as (1) the
UAS does not barf and (2) the real Content-Dispositions are present on all
of the sub-parts.


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