signature
The signature value from the result. Depending on the requested signature type and algorithm, this value will be in one of the following formats:
HTTP_REQUEST_VIA_HEADERS- hex encoding of the binary signature valueHTTP_REQUEST_VIA_QUERY_PARAMS- hex encoding of the binary signature valueHTTP_REQUEST_CHUNK/SIGV4- hex encoding of the binary signature valueHTTP_REQUEST_CHUNK/SIGV4_ASYMMETRIC- '*'-padded hex encoding of the binary signature valueHTTP_REQUEST_EVENT- hex encoding of the binary signature value