@Override
    public Mono<HttpHeaders> exchangeForHeadersMono(HttpRequestValues requestValues) {
        return execute(requestValues).map(response -> response.headers().asHttpHeaders());
    }
Returns a new {@link ArmeriaHttpExchangeAdapterBuilder} with the specified {@link WebClient}.
spring/spring6/src/main/java/com/linecorp/armeria/spring/client/ArmeriaHttpExchangeAdapter.java