public RouteBuilder methods(Iterable<HttpMethod> methods) {
        this.methods = Sets.immutableEnumSet(requireNonNull(methods, "methods"));
        return this;
    }
Sets the {@link Route} to support the specified {@link HttpMethod}s. If not set,
the mapped {@link HttpService} accepts any {@link HttpMethod}s.
core/src/main/java/com/linecorp/armeria/server/RouteBuilder.java