我想缓存我的web应用程序的某个部分。清漆缓存和标题
我有一个端点在http://website.dev/pictures/:id
,返回PHP生成的图片。有时候,端点可以使用查询字符串中的宽度和高度来定义图片尺寸:http://website.dev/pictures/:id?w=100&h=100
。
所以我想缓存这些请求很长一段时间。
我尝试了很简单的VCL,因为我是新来的,而我不想做复杂的事情:
vcl 4.0;
backend default {
.host = "127.0.0.1";
.port = "80";
}
sub vcl_recv {
if (req.url ~ "^/api/pictures" && req.method ~ "GET") {
# I heard that it was better to unset the cookies here to allow cache
unset req.http.cookie;
return (hash);
}
return (pass);
}
sub vcl_deliver {
if (obj.hits > 0) {
set resp.http.X-Cache = "HIT";
} else {
set resp.http.X-Cache = "MISS";
}
}
但现在,我得到我请求所有MISS。我试图修改才能从我的后端传来的应答有适当的Cache-Control和Expires头:
Response Headers:
Accept-Ranges:bytes
Age:0
Cache-Control:max-age=10000, private
Connection:keep-alive
Content-Length:96552
Content-Type:image/jpeg
Date:Sun, 30 Jul 2017 16:41:58 GMT
Expires:Fri, 01 Jan 2100 00:00:00 GMT
Server:nginx/1.10.3 (Ubuntu)
Via:1.1 varnish (Varnish/5.1)
X-Cache:MISS
X-RateLimit-Limit:60
X-RateLimit-Remaining:57
X-Varnish:32772
Request Headers
view source
Accept:text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8
Accept-Encoding:gzip, deflate
Accept-Language:fr-FR,fr;q=0.8,en-US;q=0.6,en;q=0.4,es;q=0.2
Cache-Control:max-age=0
Connection:keep-alive
Cookie:_ga=xxxxxxxxxxxxx
Host:website.dev:6081
Upgrade-Insecure-Requests:1
User-Agent:Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/59.0.3071.115 Safari/537.36
哪里错了我在这里?我怎样才能确保这些端点上的请求,并且只能长时间被Varnish缓存?