Aerys\StandardResponse::isValidHeaderValue PHP Method

    private function isValidHeaderValue(string $value) : bool
    {
        // field-value    = *( field-content / obs-fold )
        // field-content  = field-vchar [ 1*( SP / HTAB ) field-vchar ]
        // field-vchar    = VCHAR / obs-text
        //
        // obs-fold       = CRLF 1*( SP / HTAB )
        //                ; obsolete line folding
        //                ; see Section 3.2.4
        return true;
    }