为什么我的extra_bindings无法与ESP一起对gRPC进行转码？

Question

我正在使用Google的可扩展服务代理在gRPC和REST之间为我的API转码。

我有一个看起来像这样的RPC：

// Get a portfolio by ID.
rpc GetPortfolio(PortfolioId) returns (Portfolio) {
    option (google.api.http) = {
        get: "/v1/portfolios/{own_id.uuid}"
        additional_bindings {
            get: "/v1/organisations/{organisation_id.uuid}/portfolio"
        }
        additional_bindings {
            get: "/v1/nations/{nation_id.uuid}/portfolio"
        }
        additional_bindings {
            get: "/v1/associations/{association_id.uuid}"
        }
    };
}

，PortfolioId消息如下：

// A resource used to identify portfolios
// User-generated portfolios have their own ID
// Organisational and national portfolios connect to the organisation or nation respectively
// WGA and SIL portfolios are both singletons and can be identified by booleans
// The way in which a portfolio is identified also indicates which type of portfolio it is.
message PortfolioId {
    // To identify a portfolio no more than one of these will be set
    oneof id {
        // The user-generated portfolio ID
        Id own_id = 5;
        // The ID of the organisation the organisational portfolio is for
        Id organisation_id = 7;
        // The ID of the nation the national portfolio is for
        Id nation_id = 9;
        // The ID of the association the association portfolio is for
        Id association_id = 12;
    }
}

注释的additional_bindings部分似乎不起作用。它没有显示在我的开发人员门户中，当我尝试使用它们时，出现method does not exist错误。

第一个绑定get: "/v1/portfolios/{own_id.uuid}"有效。

我做错什么了吗？

ESP来自这里： gcr.io/endpoints-release/endpoints-runtime:1.32