Hi Andy,
Some comments on your four points above:
a) yup, absolutely,
b) Ideally xrootd would select the requested algorithm(s) with the highest (non-zero) q value. However, I'm pretty sure selecting the first supported algorithm (ignoring any q-values) will not break anything. Just by-the-by, dCache (IIRC) builds the `Want-Digest` with descending q-value, based on the number of bits. If xrootd selects the first algorithm, it should even select the one dCache prefers :-)
c) This is perfectly fine behaviour. The xrootd could also return an empty "Digest" header; i.e.,
Digest:
d) Returning an error is certainly OK (any HTTP request may return a 500 status code) but, in this case, I don't think it is necessary. The xrootd server could simply return an empty "Digest" header to indicate that none of the client's requested algorithms are supported.
Just to confirm: RFC 3230 defines the digest-algorithm values in terms of "token" (as per RFC 2616). A token may not have spaces, commas, semicolons or colons. Therefore, it's safe to use any of these to build the list.
HTH,
Paul.
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