Fix denylisting x-amz-user-agent in SignatureV4 #2882
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When checking headers for signature inclusion, they are lowercased, thus
X-Amz-User-Agent
is never skipped from signature, even though it is blacklisted exactly like that.Description of changes:
X-Amz-User-Agent turned to lowercase in blacklist, as all checks with blacklist are with lowercased headers.
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