我在 varnish 前面使用 Nginx 作为 SSL 终止器。后端是 litespeed。我有两个 wordpress 网站，它们都使用 HTTPS 协议。我在基础设施前面有一个 Haproxy，它只将 SSL 流量传递给 Nginx。
我的一个网站加载速度很快，当我通过firebug检查缓存项目的状态时，所有内容都得到了“HIT”，如.js .css和域名：domain1.com。
当我为第二个 wordpress 网站检查这些项目时，.js 和 HTML 文件得到了“MISS”，与域名 domain2.com 相同。
两个网站的 Nginx 和 Varnish 以及后端的配置相同。我还禁用了所有插件以及我认为会影响缓存的插件：WP Fastest Cache、404 to 301、Broken Link Checker 和其他一些插件。
唯一的区别是，第二个网站有一个机器人，它可以从其他网站收集新闻并将其发布到网站上（某种网络爬虫）。
什么原因导致清漆不能缓存第二个站点上的所有内容？
编辑：
我为未缓存的请求添加了 varnish 日志：
varnishlog -g request -q "ReqUrl ~ '/wp-content/themes/farda/js/jquery.min.js'"
* << Request >> 149
- Begin req 148 rxreq
- Timestamp Start: 1499626236.025652 0.000000 0.000000
- Timestamp Req: 1499626236.025652 0.000000 0.000000
- ReqStart 192.168.1.108 57470
- ReqMethod GET
- ReqURL /wp-content/themes/farda/js/jquery.min.js
- ReqProtocol HTTP/1.0
- ReqHeader X-Real-IP: 192.168.1.105
- ReqHeader X-Forwarded-For: 192.168.1.105
- ReqHeader X-Forwarded-Proto: https
- ReqHeader X-Nginx: on
- ReqHeader Host: mytourguide.ir
- ReqHeader Connection: close
- ReqHeader User-Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:51.0) Gecko/20100101 Firefox/51.0
- ReqHeader Accept: */*
- ReqHeader Accept-Language: en-US,en;q=0.5
- ReqHeader Accept-Encoding: gzip, deflate, br
- ReqHeader Referer: https://mytourguide.ir/
- ReqHeader Pragma: no-cache
- ReqHeader Cache-Control: no-cache
- ReqUnset X-Forwarded-For: 192.168.1.105
- ReqHeader X-Forwarded-For: 192.168.1.105, 192.168.1.108
- VCL_call RECV
- ReqHeader Cookie:
- ReqUnset Cookie:
- ReqHeader Cookie:
- ReqUnset Cookie:
- ReqHeader Cookie:
- ReqUnset Cookie:
- ReqHeader Cookie:
- ReqUnset Cookie:
- ReqUnset Accept-Encoding: gzip, deflate, br
- ReqHeader Accept-Encoding: gzip
- ReqUnset X-Forwarded-For: 192.168.1.105, 192.168.1.108
- ReqHeader X-Forwarded-For: 192.168.1.108
- ReqUnset Accept-Language: en-US,en;q=0.5
- ReqUnset User-Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:51.0) Gecko/20100101 Firefox/51.0
- ReqHeader cookie:
- ReqUnset cookie:
- ReqHeader cookie:
- VCL_return hash
- VCL_call HASH
- VCL_return lookup
- Debug "XXXX MISS"
- VCL_call MISS
- VCL_return fetch
- Link bereq 150 fetch
- Timestamp Fetch: 1499626236.029726 0.004075 0.004075
- RespProtocol HTTP/1.1
- RespStatus 200
- RespReason OK
- RespHeader Cache-Control: max-age=2592000, private
- RespHeader Expires: Mon, 09 Jul 2018 18:50:18 GMT
- RespHeader Last-Modified: Tue, 17 Jan 2017 14:46:21 GMT
- RespHeader Content-Type: text/javascript; charset=UTF-8
- RespHeader Content-Length: 33342
- RespHeader Content-Encoding: gzip
- RespHeader Vary: Accept-Encoding,User-Agent
- RespHeader Date: Sun, 09 Jul 2017 18:50:18 GMT
- RespHeader Accept-Ranges: bytes
- RespHeader Server: LiteSpeed
- RespHeader X-Varnish: 149
- RespHeader Age: 0
- RespHeader Via: 1.1 varnish-v4
- VCL_call DELIVER
- RespHeader X-Cache: MISS
- RespUnset X-Varnish: 149
- RespUnset Via: 1.1 varnish-v4
- RespHeader X-Configured-By: ServerSetup.ir
- VCL_return deliver
- Timestamp Process: 1499626236.029739 0.004087 0.000012
- Debug "RES_MODE 2"
- RespHeader Connection: close
- RespHeader Accept-Ranges: bytes
- Timestamp Resp: 1499626236.030691 0.005039 0.000952
- Debug "XXX REF 2"
- ReqAcct 445 0 445 448 33342 33790
- End
** << BeReq >> 150
-- Begin bereq 149 fetch
-- Timestamp Start: 1499626236.025722 0.000000 0.000000
-- BereqMethod GET
-- BereqURL /wp-content/themes/farda/js/jquery.min.js
-- BereqProtocol HTTP/1.0
-- BereqHeader X-Real-IP: 192.168.1.105
-- BereqHeader X-Forwarded-Proto: https
-- BereqHeader X-Nginx: on
-- BereqHeader Host: mytourguide.ir
-- BereqHeader Accept: */*
-- BereqHeader Referer: https://mytourguide.ir/
-- BereqHeader Pragma: no-cache
-- BereqHeader Accept-Encoding: gzip
-- BereqHeader X-Forwarded-For: 192.168.1.108
-- BereqHeader cookie:
-- BereqProtocol HTTP/1.1
-- BereqHeader X-Varnish: 150
-- VCL_call BACKEND_FETCH
-- VCL_return fetch
-- Backend 17 apache web1(192.168.1.11,,5050)
-- Timestamp Bereq: 1499626236.025798 0.000076 0.000076
-- Timestamp Beresp: 1499626236.027971 0.002249 0.002173
-- BerespProtocol HTTP/1.1
-- BerespStatus 200
-- BerespReason OK
-- BerespHeader Cache-Control: max-age=2592000, private
-- BerespHeader Expires: Mon, 09 Jul 2018 18:50:18 GMT
-- BerespHeader Last-Modified: Tue, 17 Jan 2017 14:46:21 GMT
-- BerespHeader Content-Type: text/javascript; charset=UTF-8
-- BerespHeader Content-Length: 33342
-- BerespHeader Content-Encoding: gzip
-- BerespHeader Vary: Accept-Encoding,User-Agent
-- BerespHeader Date: Sun, 09 Jul 2017 18:50:18 GMT
-- BerespHeader Accept-Ranges: bytes
-- BerespHeader Server: LiteSpeed
-- BerespHeader Connection: Keep-Alive
-- TTL RFC 2592000 -1 -1 1499626236 1499626236 1499626218 1531162218 2592000
-- VCL_call BACKEND_RESPONSE
-- TTL VCL 120 10 0 1499626236
-- VCL_return deliver
-- Storage malloc Transient
-- ObjProtocol HTTP/1.1
-- ObjStatus 200
-- ObjReason OK
-- ObjHeader Cache-Control: max-age=2592000, private
-- ObjHeader Expires: Mon, 09 Jul 2018 18:50:18 GMT
-- ObjHeader Last-Modified: Tue, 17 Jan 2017 14:46:21 GMT
-- ObjHeader Content-Type: text/javascript; charset=UTF-8
-- ObjHeader Content-Length: 33342
-- ObjHeader Content-Encoding: gzip
-- ObjHeader Vary: Accept-Encoding,User-Agent
-- ObjHeader Date: Sun, 09 Jul 2017 18:50:18 GMT
-- ObjHeader Accept-Ranges: bytes
-- ObjHeader Server: LiteSpeed
-- Fetch_Body 3 length stream
-- Gzip u F - 33342 95992 80 206366 266672
-- BackendReuse 17 web1(192.168.1.11,,5050)
-- Timestamp BerespBody: 1499626236.030637 0.004915 0.002666
-- Length 33342
-- BereqAcct 291 0 291 375 33342 33717
-- End
答案1
问题出在后端（LiteSpeed）。
请注意你的 varnishlog 中的此行：
-- ObjHeader Cache-Control: max-age=2592000, private
Varnish 内置 VCL 将不缓存发送的 URLCache-Control: private。因此它始终不被缓存，而是MISS稍后再被缓存。
正确的解决方法：配置 LiteSpeed启用公共缓存而不是私有缓存。