发送的ETag与$资源 [英] Sending ETag with $resource

问题描述

采用了棱角分明JS的$资源服务，是否有指定的第二，第三等的。如果无 - 匹配和ETag头信息的方式资源的调查？

Using Angular JS's $resource service, is there a way to specify the If-None-Match and ETag headers for the 2nd, 3rd, etc polls of a resource?

    var SummarySearch = $resource(<<apiurl>>,
        { },
        {
            get: {
                method: 'GET',
                headers: {
                    'x-header': 'id'
                }
            }
        });

我已经得到此项为设定恒定头的工作（这只是 X-头：ID 在这种情况下），但我需要的东西，每个请求的变化，基于ETag我最后一次见到。

I've gotten this to work for setting a constant header (it's just x-header: id in this case), but I need something that varies per request, based on the ETag I last saw.

更新：

transformRequest 看起来前途无量，但我没有访问我发起的请求，或者这些数据的最终URL中的数据。至于我可以告诉我只能访问到身体我会过帐（未定​​义在我的情况，因为我正在做一个GET）和headersGetter功能。

transformRequest looked promising, but I don't have access to the data that I initiated the request with, or the URL where that data ended up. As far as I can tell I only have access to the body I'd be POSTing (undefined in my case since I'm doing a GET) and the headersGetter function.

推荐答案

我发现，$资源处理其自身的ETag。

I discovered that $resource handles ETags on its own.

当我发布这个问题我还没有实现的东西服务器端。我设置了如果 - 无 - 匹配处理服务器端搞清楚我必须只使用$ HTTP服务的客户端上，但我现有的资源$电话。获得尝试过了，它处理建立如果 - 无 - 匹配我的资源的第一次轮询后自动报头。

I hadn't implemented the server side of things when I posted this question. I set up If-None-Match handling server side figuring I'd have to just use the $http service on the client, but tried it out with my existing $resource .get call and it handles setting up the If-None-Match header automatically after my first poll of the resource.

我重用1实例$资源设置过程中返回。我认为这是必需的自动处理的ETag

I am reusing the 1 instance that $resource returned during setup. I assume this is required for automatic ETag handling.

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