private InvocationContext newInvocationContext(AggregatedHttpRequest req, Map<String, Object> arguments) {
        if (HAS_PRODUCIBLE_OPERATION_ARGUMENT_RESOLVER) {
            final OperationArgumentResolver acceptHeadersResolver = acceptHeadersResolver(req.headers());
            if (!HAS_WEB_SERVER_NAMESPACE) {
                return new InvocationContext(SecurityContext.NONE, arguments, acceptHeadersResolver);
            }

            return new InvocationContext(SecurityContext.NONE, arguments,
                                         namespaceResolver(isServerNamespace), acceptHeadersResolver);
        }
        return new InvocationContext(SecurityContext.NONE, arguments);
    }
{@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