varnish-4.x VCL之cookie及缓存时间

varnish-4.x VCL之cookie及缓存时间

cookie

varnish对cookie默认不缓存，官方也不建议缓存cookie相关内容

可以强制varnish缓存cookie,官方推荐的cookie操作模块

https://github.com/lkarsten/libvmod-cookie

Add hash_data(req.http.Cookie); in vcl_hash.

• req.http.Cookie header field from clients

• beresp.http.Set-Cookie header field from servers

不缓存cookie有2个主要原因:

1.避免大量相同缓存副本而污染整个缓存

2.避免将基于cookie的缓存副本错误地deliver给了不相干的客户端

strip掉所有Set-Cookie Header相关的内容

if (beresp.ttl > 0s) {

    unset beresp.http.Set-cookie;

}

http -p hH http://localhost/cookies.php "Cookie: user=Alice"

GET /cookies.php HTTP/1.1

Accept: */*

Accept-Encoding: gzip, deflate

Connection: keep-alive

Cookie:  user=Alice

Host: localhost

User-Agent: HTTPie/0.9.3

HTTP/1.1 200 OK

Accept-Ranges: bytes

Age: 0

Connection: keep-alive

Content-Encoding: gzip

Content-Type: text/plain;charset=UTF-8

Date: Thu, 14 Apr 2016 10:38:54 GMT

Server: nginx/1.8.0

Transfer-Encoding: chunked

Vary: Accept-Encoding

Via: 1.1 varnish-v4

X-Powered-By: PHP/5.6.17

X-Varnish: 262192

x-url: /cookies.php

默认情况下，带Cookie的Age:0，不缓存

缓存时间

示例:

sub vcl_backend_response {

    if (beresp.http.cache-control !~ "s-maxage" && bereq.url ~ "\.(html|htm)") {

        set beresp.ttl = 10s;

    }

    if (beresp.http.cache-control !~ "s-maxage" && bereq.url ~ "\.jpg$") {

        set beresp.ttl = 10s;

    }

    if (beresp.status == 503) {

        return (retry);

    }

}

s-maxage没定义，并且后缀为.jpg的缓存10s