Function jsonrpc_http_server::cors::get_cors_allow_headers

pub fn get_cors_allow_headers<T, O, F, impl Iterator, impl Iterator>(
    headers: impl Iterator, 
    requested_headers: impl Iterator, 
    cors_allow_headers: &AccessControlAllowHeaders, 
    to_result: F
) -> AllowCors<Vec<O>> where
    F: Fn(T) -> O,
    T: AsRef<str>,
    impl Iterator: Iterator<Item = T, Item = T> + Iterator, 

Validates if the AccessControlAllowedHeaders in the request are allowed.