Chrome 浏览器未将 if-modified-since 标头发送到服务器 [英] Chrome browser is not sending if-modified-since header to server

问题描述

服务器将这些标头发送给客户端:

I have these headers being sent to the client by the server:

Cache-Control:private
Connection:keep-alive
Content-Encoding:gzip
Content-Type:text/html
Date:Sun, 27 Nov 2011 11:10:38 GMT
ETag:"12341234"
Set-Cookie:connect.sid=e1u...7o; path=/; expires=Sun, 27 Nov 2011 11:40:38 GMT; httpOnly
Transfer-Encoding:chunked
last-modified:Sat, 26 Nov 2011 21:42:45 GMT

我希望客户端验证文件在服务器上没有更改，如果它有304"，则发送200".

I want the client to validate that the file hasn't changed on the server and send a "200" if it has otherwise a "304".

Firefox 发送:

Firefox sends:

if-modified-since: Sat, 26 Nov 2011 21:42:45 GMT
if-none-match: "12341234"

为什么刷新页面时 chrome 不发送相同的内容?我正在关注.Net 运行的行为:

Why isn't the chrome sending the same on a refresh of the page? I'm after the behavior that .Net has running:

context.Response.Cache.SetCacheability(HttpCacheability.ServerAndPrivate)

推荐答案

根据我的经验，您需要的不仅仅是Private"Cache-Control 标头.您需要Max-Age"或Expires"来强制 Chrome 使用服务器重新验证内容.

In my experience you need more than just the "Private" Cache-Control header. You need either "Max-Age" or "Expires" to force Chrome to revalidate content with the server.

请记住，重新验证只会在这些时间值过去后开始，因此可能需要将它们设置为一个较小的值.

Remember that revalidation will only start after these time values have elapsed, so they may need to be set to a small value.

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