Function extract_header_config 

pub fn extract_header_config<H, T, G>(
    request: &G,
    header_name: H,
) -> Result<T, HeaderValueErr>
where
    H: AsHeaderName + Copy,
    T: DeserializeOwned + Send + Sync + 'static,
    G: HeaderValueGetter,

Extract a header config from a request or response without consuming it.