indigophox commented on PR #34817:
URL: https://github.com/apache/arrow/pull/34817#issuecomment-1906939773

   Not thinking about the DoExchange case yet, but as far as DoAction, I 
believe that (I'm assuming we're talking about also eliminating the implicit 
callback at :515 for sanity?) moving the SendingHeaders call to after the 
handler call at :522 is exactly the solution needed.  I looked into the call 
path down from :515 and there's a lot of fanout and so far I'm not following 
the semantics perfectly—I can spend some more time on that unless you have some 
minutes to do the chainsaw work there and see if it flies?  I can rebase 
against an experimental commit of the and confirm whether it makes the 
middleware callback order correct (as I fully expect it would, but just to be 
sure..).   Thanks!


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