public AbstractJettyServiceBuilder attr(String name, Object attribute) {
        attrs.put(requireNonNull(name, "name"), requireNonNull(attribute, "attribute"));
        return this;
    }
Puts the specified attribute into the Jetty {@link Server}.

@see Server#setAttribute(String, Object)
jetty/jetty11/src/main/java/com/linecorp/armeria/server/jetty/AbstractJettyServiceBuilder.java