Azure API 管理 - 操作的 Etag

发布于 2025-01-18 16:42:09 字数 146 浏览 3 评论 0 原文

我们是Azure API管理的新手。我们正在缓存DataVerse Master实体Web API调用，并希望查看如何添加ETAG作为Azure API管理中响应标头的一部分（后端呼叫也没有此标头）。我们如何在操作级别检索它？并且是否有任何参考文献文档。抱歉找不到任何。提前致谢

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〃温暖了心ぐ 2025-01-25 16:42:09

我们正在缓存DataVerse Master实体Web API调用，并希望查看如何将ETAG作为Azure API管理中的响应标头的一部分添加（后端呼叫也没有此标头）。我们如何在操作级别检索它？

获取由标识符指定的后端的实体状态（ETAG）版本。

HEAD https://management.azure.com/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.ApiManagement/service/{serviceName}/backends/{backendId}?api-version=2021-04-01-preview

web api api实现：

public class OrdersController : ApiController
{
    ...
    public IHttpActionResult FindOrderByID(int id)
    {
        // Find the matching order
        Order order = ...;
        ...

        var hashedOrder = order.GetHashCode();
        string hashedOrderEtag = $"\"{hashedOrder}\"";
        var eTag = new EntityTagHeaderValue(hashedOrderEtag);

        // Return a response message containing the order and the cache control header
        OkResultWithCaching<Order> response = new OkResultWithCaching<Order>(order, this)
        {
            ...,
            ETag = eTag
        };
        return response;
    }
    ...
}

您可以参考，和什么是etag，以及为什么人们使用它

We are caching Dataverse master entities web api calls and looking to see how we can add ETag as part of response headers in Azure API Management(Backend call doesnt have this header as well). How do we retrieve this at Operations level ?

Get the entity state (Etag) version of the backend specified by its identifier.

HEAD https://management.azure.com/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.ApiManagement/service/{serviceName}/backends/{backendId}?api-version=2021-04-01-preview

Web API implementation:

public class OrdersController : ApiController
{
    ...
    public IHttpActionResult FindOrderByID(int id)
    {
        // Find the matching order
        Order order = ...;
        ...

        var hashedOrder = order.GetHashCode();
        string hashedOrderEtag = quot;\"{hashedOrder}\"";
        var eTag = new EntityTagHeaderValue(hashedOrderEtag);

        // Return a response message containing the order and the cache control header
        OkResultWithCaching<Order> response = new OkResultWithCaching<Order>(order, this)
        {
            ...,
            ETag = eTag
        };
        return response;
    }
    ...
}

You can refer to Backend - Get Entity Tag, Does Azure Search Provides Etags for managing concurrency for Add, Update or Delete Documents? and What is ETag and why people use it