public function isInvalid(): bool
    {
        return $this->statusCode < StatusCode::CONTINUE
            || $this->statusCode >= StatusCode::NETWORK_AUTHENTICATION_REQUIRED;
    }
public function isInvalid(): bool
    {
        return $this->statusCode < StatusCode::CONTINUE
            || $this->statusCode >= StatusCode::NETWORK_AUTHENTICATION_REQUIRED;
    }
public function isInvalid ( ) : bool { return $ this -> statusCode < StatusCode :: CONTINUE || $ this -> statusCode >= StatusCode :: NETWORK_AUTHENTICATION_REQUIRED ; }
Is response invalid?

@return bool

@see http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html
Is response invalid?