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清漆4：如何使用Cookie清除缓存

[英]Varnish 4: how to purge cache with cookies

 原文  2017-03-02 12:41:31  1   1    varnish/ varnish-vcl/ varnish-4

问题描述

Our software uses a cookie "selected_language" when people change language from Spanish to anything else. 当人们将语言从西班牙语更改为其他语言时，我们的软件将使用cookie“ selected_language”。 By default the cookie is not set. 默认情况下未设置cookie。

We need to cache our site taking into account the language, so our index.php is cached several times,one for each language. 我们需要考虑到语言来缓存我们的网站，因此我们的index.php被缓存了几次，每种语言一个。

Our hash function uses language cookie (We get more cookies but they are removed inside vcl_recv, just the language cookie (if any) gets to the hash routine: 我们的哈希函数使用语言cookie（我们会获得更多cookie，但是它们会在vcl_recv中删除，只是语言cookie（如果有）进入哈希例程： 

sub vcl_hash {
  hash_data(req.url);
  if (req.http.host) {
    hash_data(req.http.host);
  } else {
    hash_data(server.ip);
  }
  if (req.http.Cookie) {
    hash_data(req.http.Cookie);
  }
}

Our problem comes when we want to purge our cache. 当我们要清除缓存时，就会出现问题。 If we purge our index webpage, without cookies (spanish version), everything works ok: 如果我们清除不带Cookie（西班牙语版本）的索引网页，则一切正常： 

curl -X PURGE  http://www.arasaac.org/index.php

However if we try to purge our index webpage with cookies (english version), it does nothing. 但是，如果我们尝试使用Cookie（英语版）清除索引网页，则不会执行任何操作。 I think purge uses hash so it should work if I send the related cookie. 我认为purge使用哈希，因此如果我发送相关的cookie，它应该可以工作。

Our purge code: 我们的清除代码： 

sub vcl_purge {
  # Only handle actual PURGE HTTP methods, everything else is discarded
  if (req.method != "PURGE") {
    # restart request
    set req.http.X-Purge = "Yes";
    return(restart);
  }
}

Inside vcl_recv: 在vcl_recv内部： 

  # Allow purging
  if (req.method == "PURGE") {
#    if (!client.ip ~ purge) { # purge is the ACL defined at the begining
      # Not from an allowed IP? Then die with an error.
#      return (synth(405, "This IP is not allowed to send PURGE requests."));
#    }
    # If you got this stage (and didn't error out above), purge the cached result
    return (purge);
  }

These are all the logs in case they're needed... 这些都是所有日志，以备不时之需...

I ask again for the page, that is cached: 我再次请求缓存的页面： 

*   << Request  >> 262149    
-   Begin          req 262148 rxreq
-   Timestamp      Start: 1488455938.456980 0.000000 0.000000
-   Timestamp      Req: 1488455938.456980 0.000000 0.000000
-   ReqStart       172.20.0.3 51672
-   ReqMethod      GET
-   ReqURL         /index.php
-   ReqProtocol    HTTP/1.1
-   ReqHeader      Host: www.arasaac.org
-   ReqHeader      Connection: close
-   ReqHeader      X-Real-IP: 172.20.0.1
-   ReqHeader      X-Forwarded-For: 172.20.0.1
-   ReqHeader      X-Forwarded-Proto: http
-   ReqHeader      X-Forwarded-Ssl: off
-   ReqHeader      X-Forwarded-Port: 80
-   ReqHeader      Upgrade-Insecure-Requests: 1
-   ReqHeader      User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.87 Safari/537.36
-   ReqHeader      Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
-   ReqHeader      Referer: http://www.arasaac.org/index.php
-   ReqHeader      Accept-Encoding: gzip, deflate, sdch
-   ReqHeader      Accept-Language: es-ES,es;q=0.8,en;q=0.6
-   ReqHeader      Cookie: PHPSESSID=242b73bc8a560b89308009e05af7eefd; selected_language=en; _ga=GA1.2.99795965.1488449144; _gat=1
-   ReqUnset       X-Forwarded-For: 172.20.0.1
-   ReqHeader      X-Forwarded-For: 172.20.0.1, 172.20.0.3
-   VCL_call       RECV
-   ReqUnset       Host: www.arasaac.org
-   ReqHeader      Host: www.arasaac.org
-   ReqURL         /
-   ReqUnset       Cookie: PHPSESSID=242b73bc8a560b89308009e05af7eefd; selected_language=en; _ga=GA1.2.99795965.1488449144; _gat=1
-   ReqHeader      Cookie: PHPSESSID=242b73bc8a560b89308009e05af7eefd; selected_language=en; _ga=GA1.2.99795965.1488449144; _gat=1
-   ReqUnset       Cookie: PHPSESSID=242b73bc8a560b89308009e05af7eefd; selected_language=en; _ga=GA1.2.99795965.1488449144; _gat=1
-   ReqHeader      Cookie: PHPSESSID=242b73bc8a560b89308009e05af7eefd; selected_language=en; _ga=GA1.2.99795965.1488449144; _gat=1
-   ReqUnset       Cookie: PHPSESSID=242b73bc8a560b89308009e05af7eefd; selected_language=en; _ga=GA1.2.99795965.1488449144; _gat=1
-   ReqHeader      Cookie: PHPSESSID=242b73bc8a560b89308009e05af7eefd; selected_language=en; _gat=1
-   ReqUnset       Cookie: PHPSESSID=242b73bc8a560b89308009e05af7eefd; selected_language=en; _gat=1
-   ReqHeader      Cookie: PHPSESSID=242b73bc8a560b89308009e05af7eefd; selected_language=en; 
-   ReqUnset       Cookie: PHPSESSID=242b73bc8a560b89308009e05af7eefd; selected_language=en; 
-   ReqHeader      Cookie: PHPSESSID=242b73bc8a560b89308009e05af7eefd; selected_language=en; 
-   ReqUnset       Cookie: PHPSESSID=242b73bc8a560b89308009e05af7eefd; selected_language=en; 
-   ReqHeader      Cookie: PHPSESSID=242b73bc8a560b89308009e05af7eefd; selected_language=en; 
-   ReqUnset       Cookie: PHPSESSID=242b73bc8a560b89308009e05af7eefd; selected_language=en; 
-   ReqHeader      Cookie: PHPSESSID=242b73bc8a560b89308009e05af7eefd; selected_language=en; 
-   ReqUnset       Cookie: PHPSESSID=242b73bc8a560b89308009e05af7eefd; selected_language=en; 
-   ReqHeader      Cookie: selected_language=en; 
-   ReqUnset       Cookie: selected_language=en; 
-   ReqHeader      Cookie: selected_language=en; 
-   ReqUnset       Cookie: selected_language=en; 
-   ReqHeader      Cookie: selected_language=en; 
-   ReqUnset       Cookie: selected_language=en; 
-   ReqHeader      Cookie: selected_language=en; 
-   ReqUnset       Cookie: selected_language=en; 
-   ReqHeader      Cookie: selected_language=en; 
-   VCL_return     hash
-   ReqUnset       Accept-Encoding: gzip, deflate, sdch
-   ReqHeader      Accept-Encoding: gzip
-   VCL_call       HASH
-   VCL_return     lookup
-   Hit            3
-   VCL_call       HIT
-   VCL_return     deliver
-   RespProtocol   HTTP/1.1
-   RespStatus     200
-   RespReason     OK
-   RespHeader     Date: Thu, 02 Mar 2017 11:57:52 GMT
-   RespHeader     Server: Apache/2.4.10 (Debian)
-   RespHeader     X-Powered-By: PHP/5.6.30
-   RespHeader     Vary: Accept-Encoding
-   RespHeader     Content-Encoding: gzip
-   RespHeader     Content-Length: 5379
-   RespHeader     Content-Type: text/html; charset=UTF-8
-   RespHeader     cache-control: public, max-age = 300
-   RespHeader     log: ha entrado aquí
-   RespHeader     X-CacheReason: varnishcache
-   RespHeader     X-Varnish: 262149 3
-   RespHeader     Age: 66
-   RespHeader     Via: 1.1 varnish-v4
-   VCL_call       DELIVER
-   RespHeader     X-Cache: HIT
-   RespHeader     X-Cache-Hits: 1
-   RespUnset      X-Powered-By: PHP/5.6.30
-   RespUnset      Server: Apache/2.4.10 (Debian)
-   RespUnset      X-Varnish: 262149 3
-   RespUnset      Via: 1.1 varnish-v4
-   VCL_return     deliver
-   Timestamp      Process: 1488455938.457118 0.000138 0.000138
-   RespHeader     Accept-Ranges: bytes
-   Debug          "RES_MODE 2"
-   RespHeader     Connection: close
-   Timestamp      Resp: 1488455938.457194 0.000215 0.000077
-   ReqAcct        658 0 658 336 5379 5715
-   End

I try to purge the page, so I send the cookie: 我尝试清除页面，所以发送cookie：

curl -X PURGE --cookie "selected_language=en" http://www.arasaac.org/index.php curl -X PURGE --cookie“ selected_language = zh-CN” http://www.arasaac.org/index.php

Logs seem good for me: 日志对我来说似乎很好： 

*   << Request  >> 28        
-   Begin          req 27 rxreq
-   Timestamp      Start: 1488456128.433721 0.000000 0.000000
-   Timestamp      Req: 1488456128.433721 0.000000 0.000000
-   ReqStart       172.20.0.3 53286
-   ReqMethod      PURGE
-   ReqURL         /index.php
-   ReqProtocol    HTTP/1.1
-   ReqHeader      Host: www.arasaac.org
-   ReqHeader      Connection: close
-   ReqHeader      X-Real-IP: 172.20.0.1
-   ReqHeader      X-Forwarded-For: 172.20.0.1
-   ReqHeader      X-Forwarded-Proto: http
-   ReqHeader      X-Forwarded-Ssl: off
-   ReqHeader      X-Forwarded-Port: 80
-   ReqHeader      User-Agent: curl/7.35.0
-   ReqHeader      Accept: */*
-   ReqHeader      Cookie: selected_language=en;
-   ReqUnset       X-Forwarded-For: 172.20.0.1
-   ReqHeader      X-Forwarded-For: 172.20.0.1, 172.20.0.3
-   VCL_call       RECV
-   ReqUnset       Host: www.arasaac.org
-   ReqHeader      Host: www.arasaac.org
-   ReqURL         /
-   VCL_return     purge
-   VCL_call       HASH
-   VCL_return     lookup
-   VCL_call       PURGE
-   VCL_return     synth
-   Timestamp      Process: 1488456128.433754 0.000033 0.000033
-   RespHeader     Date: Thu, 02 Mar 2017 12:02:08 GMT
-   RespHeader     Server: Varnish
-   RespHeader     X-Varnish: 28
-   RespProtocol   HTTP/1.1
-   RespStatus     200
-   RespReason     OK
-   RespReason     Purged
-   VCL_call       SYNTH
-   VCL_return     deliver
-   RespHeader     Content-Length: 0
-   Storage        malloc Transient
-   RespHeader     Accept-Ranges: bytes
-   Debug          "RES_MODE 2"
-   RespHeader     Connection: close
-   Timestamp      Resp: 1488456128.433792 0.000070 0.000038
-   ReqAcct        261 0 261 152 0 152
-   End

However if I load again index.php in the browser, the cache is still there: 但是，如果我在浏览器中再次加载index.php，则缓存仍然存在： 

<< Request  >> 30        
-   Begin          req 29 rxreq
-   Timestamp      Start: 1488456171.661988 0.000000 0.000000
-   Timestamp      Req: 1488456171.661988 0.000000 0.000000
-   ReqStart       172.20.0.3 53688
-   ReqMethod      GET
-   ReqURL         /index.php
-   ReqProtocol    HTTP/1.1
-   ReqHeader      Host: www.arasaac.org
-   ReqHeader      Connection: close
-   ReqHeader      X-Real-IP: 172.20.0.1
-   ReqHeader      X-Forwarded-For: 172.20.0.1
-   ReqHeader      X-Forwarded-Proto: http
-   ReqHeader      X-Forwarded-Ssl: off
-   ReqHeader      X-Forwarded-Port: 80
-   ReqHeader      Upgrade-Insecure-Requests: 1
-   ReqHeader      User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.87 Safari/537.36
-   ReqHeader      Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
-   ReqHeader      Referer: http://www.arasaac.org/index.php
-   ReqHeader      Accept-Encoding: gzip, deflate, sdch
-   ReqHeader      Accept-Language: es-ES,es;q=0.8,en;q=0.6
-   ReqHeader      Cookie: PHPSESSID=242b73bc8a560b89308009e05af7eefd; selected_language=en; _gat=1; _ga=GA1.2.99795965.1488449144
-   ReqUnset       X-Forwarded-For: 172.20.0.1
-   ReqHeader      X-Forwarded-For: 172.20.0.1, 172.20.0.3
-   VCL_call       RECV
-   ReqUnset       Host: www.arasaac.org
-   ReqHeader      Host: www.arasaac.org
-   ReqURL         /
-   ReqUnset       Cookie: PHPSESSID=242b73bc8a560b89308009e05af7eefd; selected_language=en; _gat=1; _ga=GA1.2.99795965.1488449144
-   ReqHeader      Cookie: PHPSESSID=242b73bc8a560b89308009e05af7eefd; selected_language=en; _gat=1; _ga=GA1.2.99795965.1488449144
-   ReqUnset       Cookie: PHPSESSID=242b73bc8a560b89308009e05af7eefd; selected_language=en; _gat=1; _ga=GA1.2.99795965.1488449144
-   ReqHeader      Cookie: PHPSESSID=242b73bc8a560b89308009e05af7eefd; selected_language=en; _gat=1; _ga=GA1.2.99795965.1488449144
-   ReqUnset       Cookie: PHPSESSID=242b73bc8a560b89308009e05af7eefd; selected_language=en; _gat=1; _ga=GA1.2.99795965.1488449144
-   ReqHeader      Cookie: PHPSESSID=242b73bc8a560b89308009e05af7eefd; selected_language=en; _gat=1; 
-   ReqUnset       Cookie: PHPSESSID=242b73bc8a560b89308009e05af7eefd; selected_language=en; _gat=1; 
-   ReqHeader      Cookie: PHPSESSID=242b73bc8a560b89308009e05af7eefd; selected_language=en; 
-   ReqUnset       Cookie: PHPSESSID=242b73bc8a560b89308009e05af7eefd; selected_language=en; 
-   ReqHeader      Cookie: PHPSESSID=242b73bc8a560b89308009e05af7eefd; selected_language=en; 
-   ReqUnset       Cookie: PHPSESSID=242b73bc8a560b89308009e05af7eefd; selected_language=en; 
-   ReqHeader      Cookie: PHPSESSID=242b73bc8a560b89308009e05af7eefd; selected_language=en; 
-   ReqUnset       Cookie: PHPSESSID=242b73bc8a560b89308009e05af7eefd; selected_language=en; 
-   ReqHeader      Cookie: PHPSESSID=242b73bc8a560b89308009e05af7eefd; selected_language=en; 
-   ReqUnset       Cookie: PHPSESSID=242b73bc8a560b89308009e05af7eefd; selected_language=en; 
-   ReqHeader      Cookie: selected_language=en; 
-   ReqUnset       Cookie: selected_language=en; 
-   ReqHeader      Cookie: selected_language=en; 
-   ReqUnset       Cookie: selected_language=en; 
-   ReqHeader      Cookie: selected_language=en; 
-   ReqUnset       Cookie: selected_language=en; 
-   ReqHeader      Cookie: selected_language=en; 
-   ReqUnset       Cookie: selected_language=en; 
-   ReqHeader      Cookie: selected_language=en; 
-   VCL_return     hash
-   ReqUnset       Accept-Encoding: gzip, deflate, sdch
-   ReqHeader      Accept-Encoding: gzip
-   VCL_call       HASH
-   VCL_return     lookup
-   Hit            3
-   VCL_call       HIT
-   VCL_return     deliver
-   RespProtocol   HTTP/1.1
-   RespStatus     200
-   RespReason     OK
-   RespHeader     Date: Thu, 02 Mar 2017 11:57:52 GMT
-   RespHeader     Server: Apache/2.4.10 (Debian)
-   RespHeader     X-Powered-By: PHP/5.6.30
-   RespHeader     Vary: Accept-Encoding
-   RespHeader     Content-Encoding: gzip
-   RespHeader     Content-Length: 5379
-   RespHeader     Content-Type: text/html; charset=UTF-8
-   RespHeader     cache-control: public, max-age = 300
-   RespHeader     log: ha entrado aquí
-   RespHeader     X-CacheReason: varnishcache
-   RespHeader     X-Varnish: 30 3
-   RespHeader     Age: 299
-   RespHeader     Via: 1.1 varnish-v4
-   VCL_call       DELIVER
-   RespHeader     X-Cache: HIT
-   RespHeader     X-Cache-Hits: 2
-   RespUnset      X-Powered-By: PHP/5.6.30
-   RespUnset      Server: Apache/2.4.10 (Debian)
-   RespUnset      X-Varnish: 30 3
-   RespUnset      Via: 1.1 varnish-v4
-   VCL_return     deliver
-   Timestamp      Process: 1488456171.662050 0.000061 0.000061
-   RespHeader     Accept-Ranges: bytes
-   Debug          "RES_MODE 2"
-   RespHeader     Connection: close
-   Timestamp      Resp: 1488456171.662105 0.000117 0.000056
-   ReqAcct        658 0 658 337 5379 5716
-   End

By the way.. how is it that ReqHeader and Reqset lines in logs related to cookies are repeated many times? 顺便说一句..与cookie相关的日志中的ReqHeader和Reqset行如何重复多次？ 

    -   ReqUnset       Cookie: PHPSESSID=242b73bc8a560b89308009e05af7eefd; selected_language=en; _gat=1; _ga=GA1.2.99795965.1488449144
    -   ReqHeader      Cookie: PHPSESSID=242b73bc8a560b89308009e05af7eefd; selected_language=en; _gat=1; _ga=GA1.2.99795965.1488449144
    -   ReqUnset       Cookie: PHPSESSID=242b73bc8a560b89308009e05af7eefd; selected_language=en; _gat=1; _ga=GA1.2.99795965.1488449144
    -   ReqHeader      Cookie: PHPSESSID=242b73bc8a560b89308009e05af7eefd; selected_language=en; _gat=1; _ga=GA1.2.99795965.1488449144
    -   ReqUnset       Cookie: PHPSESSID=242b73bc8a560b89308009e05af7eefd; selected_language=en; _gat=1; _ga=GA1.2.99795965.1488449144
    -   ReqHeader      Cookie: PHPSESSID=242b73bc8a560b89308009e05af7eefd; selected_language=en; _gat=1; 
...

1 个解决方案

解决方案1
 2 已采纳  2017-03-02 13:00:06

My wild guess is that when you cleaning the cookies you end up with: 我的疯狂猜测是，当您清洁Cookie时，最终得到：

"selected_language=en; " (with trailing space) "selected_language=en; " （带有尾随空格）

Whereas in your purge request you're passing 而在您的清除请求中，您正在通过

"selected_language=en;"

Try to send purge like this: 尝试像这样发送清除： 

curl -X PURGE --cookie "selected_language=en " http://www.arasaac.org/index.php

The repeated lines you see in varnishlog are for every time your VCL code tries to unset or manipulate cookie value otherwise (during cleanup stage). 您在varnishlog中看到的重复行是针对您的VCL代码每次尝试取消设置或操作cookie值的其他情况（在清理阶段）。

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