VCL语法及变量
https://www.varnish-cache.org/docs/4.1/reference/vcl.html

Http header的作用
https://www.varnish-cache.org/docs/4.0/users-guide/increasing-your-hitrate.html

VSL查询匹配(Log)
https://www.varnish-cache.org/docs/4.0/reference/vsl-query.html
VSL tags
https://www.varnish-cache.org/docs/4.0/reference/vsl.html

管理
https://www.varnish-cache.org/docs/4.1/users-guide/run_cli.html
https://www.varnish-cache.org/docs/4.1/reference/varnish-cli.html#varnish-cli-7
https://www.varnish-cache.org/docs/4.1/reference/varnishadm.html

刷新缓存
ban req.url ~ gc
https://www.varnish-cache.org/trac/wiki/VCLExampleEnableForceRefresh