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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