如何将Expires响应标头添加到WebAPI Action响应？ [英] How to add an Expires response header to a WebAPI Action response?

问题描述

我非常确定 Expires是有效的HTTP响应标头类型。但是，当我尝试在代码中进行设置时：（这在ActionFilter.OnActionExecuted方法中）

I'm pretty sure that "Expires" is valid HTTP Response Header type. But when I try to set it in my code: (this is in an ActionFilter.OnActionExecuted method)

actionExecutedContext.Response.Headers.Add("Expires", (DateTime.Now + Timespan.FromDays(7)).ToString("R"));

我最终遇到一个例外：

InvalidOperationException：标头名称误用。确保请求
头与HttpRequestMessage一起使用，响应头与
HttpResponseMessage一起使用，内容头与HttpContent对象一起使用。

InvalidOperationException: Misused header name. Make sure request headers are used with HttpRequestMessage, response headers with HttpResponseMessage, and content headers with HttpContent objects.

推荐答案

Expires是一个内容标头。改为尝试以下操作：

Expires is a content header. Try this instead:

actionExecutedContext.Response.Content.Headers.Expires = DateTimeOffset.Now.AddDays(7);

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