的ASP.NET Web API：请求的资源不支持HTTP方法“GET”

我有上ApiController以下动作：

I've got the following action on an ApiController:

public string Something()
{
    return "value";
}

和我如下配置我的路线：

And I've configured my routes as follows:

routes.MapHttpRoute(
    name: "DefaultApi",
    routeTemplate: "api/{controller}/{action}/{id}",
    defaults: new { id = RouteParameter.Optional }
);

在测试版，这工作得很好，但我只更新到最新的候选发布版，现在我看到像这样的调用错误：

In the beta, this worked just fine, but I just updated to the latest Release Candidate and now I'm seeing errors on calls like this:

所请求的资源不支持HTTP方法GET。

The requested resource does not support http method 'GET'.

为什么不这项工作了？

（我想我可以摆脱{}行动，只是做一吨的控制器，但感觉凌乱。）

(I suppose I could get rid of {action} and just make a ton of controllers, but that feels messy.)