Use the literal string 'STREAMING-AWS4-HMAC-SHA256-EVENTS' as the canonical request payload value
Use the literal string 'STREAMING-AWS4-HMAC-SHA256-PAYLOAD' as the canonical request payload value
Use the literal string 'UNSIGNED-PAYLOAD' as the canonical request payload value
Use the SHA-256 of the empty string as the canonical request payload value
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Values for use with signed_body_value.
Some services use special values (e.g. 'UNSIGNED-PAYLOAD') when the body is not being signed in the usual way.