private String authenticationOrReauthenticationText() {
            return reauthenticating() ? "re-authentication" : "authentication";
        }
Return the (always non-null but possibly empty) NetworkReceive response that
arrived during re-authentication that is unrelated to re-authentication, if
any. This corresponds to a request sent prior to the beginning of
re-authentication; the request was made when the channel was successfully
authenticated, and the response arrived during the re-authentication
process.

@return the (always non-null but possibly empty) NetworkReceive response
        that arrived during re-authentication that is unrelated to
        re-authentication, if any
clients/src/main/java/org/apache/kafka/common/security/authenticator/SaslClientAuthenticator.java