default AuthScheme get(HttpHost host, String pathPrefix) {
        return get(host);
    }
Returns the authentication state with the given authentication scope from the cache
if available.
@param host the authentication authority.
@param pathPrefix the path prefix (the path component up to the last segment separator).
                  Can be {@code null}.
@return the authentication state ir {@code null} if not available in the cache.

@since 5.2
httpclient5/src/main/java/org/apache/hc/client5/http/auth/AuthCache.java