> Table 4 of bis-02 shows that for the CANCEL request, 
> Content-Language header is optional. Why is it that CANCEL does 
> not have Content-Disposition, Content-Encoding, or Content-Type, 
> but has Content-Language?

I would imagine this is an oversight; pretty much nothing
besides the fundamental (i.e., transaction-identifying)
headers makes sense in a CANCEL.


 - Jo.

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