At this moment the code is doing only base64, adding the option for base32 could be an
option.
However, even the comparison has to be done case-insensitive, I am not sure that UA is
allowed to change those parameters, because they are part of the URI and the URI must be
kept unchanged, being something set by the other side, which may expect it in the same
format -- other parts of rfc about constructing the requests have to be checked.
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