@property<EOL><INDENT>def string_to_sign(self):<DEDENT>
return (AWS4_HMAC_SHA256 + "<STR_LIT:\n>" +<EOL>self.request_timestamp + "<STR_LIT:\n>" +<EOL>self.credential_scope + "<STR_LIT:\n>" +<EOL>sha256(self.canonical_request.encode("<STR_LIT:utf-8>")).hexdigest())<EOL>
The AWS SigV4 string being signed.