private static void close(Closeable in) {
        try {
            in.close();
        } catch (Exception e) {
            logger.warn("Failed to close a stream for: {}", in, e);
        }
    }
{@link HttpService} to handle a {@link WebOperation}. Mostly inspired by reactive implementation in
{@link AbstractWebFluxEndpointHandlerMapping}.
spring/boot3-actuator-autoconfigure/src/main/java/com/linecorp/armeria/spring/actuate/WebOperationService.java