Function scratchstack_aws_signature::sigv4_get_expected_signature

pub fn sigv4_get_expected_signature<A1, A2>(
    req: &Request, 
    signing_key: &SigningKey, 
    region: A1, 
    service: A2
) -> Result<String, SignatureError> where
    A1: AsRef<str>,
    A2: AsRef<str>, 

Return the expected signature for a request.