private GraphqlServiceBuilder schemaUrls0(Iterable<URL> schemaUrls) {
        checkState(graphql == null, "graphql() and schemaUrls() are mutually exclusive.");
        if (this.schemaUrls == null) {
            this.schemaUrls = ImmutableList.builder();
        }
        this.schemaUrls.addAll(requireNonNull(schemaUrls, "schemaUrls"));
        return this;
    }
Adds the schema loaded from the given URLs.
If not set, the {@code schema.graphql} or {@code schema.graphqls} will be imported from the resource.

@deprecated Use {@link #graphql(GraphQL)} instead. You can create a {@link TypeDefinitionRegistry}
            using {@link SchemaParser}, and then create {@link GraphQLSchema} using a
            {@link SchemaGenerator}. Then, set it to a {@link GraphQL.Builder}.
graphql/src/main/java/com/linecorp/armeria/server/graphql/GraphqlServiceBuilder.java