@Override
    public String toString() {
        return MoreObjects.toStringHelper(this)
                          .add("username", username)
                          .add("password", "****")
                          .toString();
    }
Returns the string that is sent as the value of the {@link HttpHeaderNames#AUTHORIZATION} header.
core/src/main/java/com/linecorp/armeria/common/auth/BasicToken.java