如何使Varnish忽略，而不是删除cookie [英] How to make Varnish ignore, not delete cookies

问题描述

即使存在Cookie，我也希望使用Varnish来缓存某些页面。我需要处理3种可能性：

I want to use Varnish to cache certain pages even in the presence of cookies. There are 3 possibilities that I need to take care of:

1. 匿名用户正在查看某个页面


2. 登录用户正在查看具有轻量级自定义的页面。这些自定义项都存储在已签名的cookie中，并由Javascript动态填充。不设置vary-cookie http标头。


3. 登录用户正在查看包含来自数据库的自定义数据的某个页面。设置了vary-cookie http标头。

预期的行为是：

1. 缓存页面。这是Varnish要处理的最基本方案。


2. 缓存页面而不删除cookie，因为有些Javascript逻辑需要它。


3. 从不缓存此页面因为vary-cookie表示cookie内容会影响此页面的输出。

我已阅读一些关于清漆的文档我无法判断这是否是默认行为，或者我是否需要在VCL中进行一些设置才能实现。

I have read some docs on Varnish and I cannot tell if this is the default behavior or if there is some setup I have to do in VCL to make it happen.

推荐答案

只有会话对每个客户都是唯一的，不一定是cookie。

Only sessions are unique to every client, not necessarily cookies.

你想要的东西是有意义的，并且可以用Varnish，这只是一个精心制作自己的问题VCL。请注意default.vcl的以下部分：

What you want makes sense and is possible with Varnish, it is just a matter of carefully crafting your own vcl. Please pay attention to the following parts of the default.vcl:

sub vcl_recv {
    ...
    if (req.http.Authorization || req.http.Cookie) {
      /* Not cacheable by default */
      return (pass);
    }
}


sub vcl_hit {
    if (!obj.cacheable) {
        return (pass);
    }
    ...
}


sub vcl_fetch {
    if (!beresp.cacheable) {
        return (pass);
    }
    if (beresp.http.Set-Cookie) {
        return (pass);
    }
    ...
}

你必须更换这些部分有你自己的逻辑;即定义您自己的vcl_函数。默认情况下，带cookie的请求（vcl_recv）和响应（vcl_fetch）不可缓存。您最了解后端应用程序，并且应该将通用缓存逻辑重写为此特定情况。也就是说，你应该定义清漆在哪种情况下进行查找，传递或传递。

You have to replace these parts with your own logic; i.e. define your own vcl_ functions. By default, requests (vcl_recv) and responses (vcl_fetch) with cookies are not cacheable. You know your back-end application best and you should rewrite the generic caching logic to this specific case. That is, you should define in which case varnish does a lookup, pass or deliver.

在你的情况下，你将有页面（案例1和2）没有变化-by cookie，将被所有人缓存和共享（带/不带cookie的请求）;只是不介意vcl_recv中的req.http.Cookie。我不会用变化的cookie来缓存页面（案例3） - 或者至少不会长时间 - 因为它们根本无法共享;在vcl_fetch中执行'pass'。

In your case, you will have pages (case 1 and 2) without a vary-by cookie, which will be cached and shared by everyone (requests with/without cookies); just don't mind req.http.Cookie in vcl_recv. I wouldn't cache pages (case 3) with a vary-by cookie -or at least not for a long time-, as they can not be shared at all; do a 'pass' in vcl_fetch.

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