Function http_sign::sign

pub fn sign<'sig_elems, SigAlg, Msg>(
    temporary_buffer: &mut BytesMut, 
    scheme: SignatureScheme, 
    sig_alg: &SigAlg, 
    message: &mut Msg, 
    expiration: Duration, 
    signature_elements: &[SignatureElement<'_>]
) -> Result<(), SignError> where
    SigAlg: SignatureAlgorithm,
    Msg: HttpRequest,