I might be missing something - is what I'm trying to do substantially different from what happens during a ``POST /file/chunk`` operation?  In that case, the chunk is sent as a slice of a ``File`` object (i.e, a ``Blob``), which then turns into a filelike object via this exact (CherryPy) mechanism, right?

In other words, it seems like I should be able emulate a ``POST /file/chunk`` operation by accepting the same kind of arguments, then devolving the rest onto ``self.readChunk()``, much as happens for ``chunk``.