Sorry for being terse on the original comment -- sometimes I have to squeeze these thoughts between other duties.
My insight is the problem is because we try and execute the HTTP response as part of a single vector IO request to the XRootD layer. There's no need for that! For example, when we read the whole file, we simply repeat 128KB (non-vector) read requests to XRootD until we get to the end of the file. There's no need to have a 1-to-1 relationship; it can be 1-to-N.
We can do the same thing here:
@ccaffy, if you want to tackle this, I'd suggest taking a look at 36df693; ignore the new feature that was working on but I'd suggest copying the cleanup of the state machine into a standalone commit, then try to build the above algorithm on the cleaner state machine.
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