Varnish状态引擎说明：
sub vcl_recv {
if (req.method == "PRI") {
/* We do not support SPDY or HTTP/2.0 */
return (synth(405));
}
if (req.method != "GET" &&
req.method != "HEAD" &&
req.method != "PUT" &&
req.method != "POST" &&
req.method != "TRACE" &&
req.method != "OPTIONS" &&
req.method != "DELETE") {
/* Non-RFC2616 or CONNECT which is weird. */
return (pipe);
}
if (req.url ~ "^(.*)\.(jpg|png|gif|jpeg|flv|bmp|gz|tgz|bz2|tbz|js|css|html|htm)($|\?)") {
unset req.http.cookie;
}
if (req.url ~ "^(.*)\.(php|jsp|do|aspx|asmx|ashx)($|.*)") {
return (pass);
}
if (req.method != "GET" && req.method != "HEAD") {
/* We only deal with GET and HEAD by default */
return (pass);
}
if (req.http.Authorization || req.http.Cookie) {
/* Not cacheable by default */
return (pass);
}
return (hash);
}
sub vcl_backend_response {
if (bereq.url ~ "^(.*)\.(pdf|xls|ppt|doc|docx|xlsx|pptx|chm|rar|zip)($|\?)") {
unset beresp.http.Set-Cookie;
set beresp.ttl = 2h;
return (deliver);
} else if(bereq.url ~ "^(.*)\.(bmp|jpeg|jpg|png|gif|svg|png|ico|txt|css|js|html|htm)($|\?)") {
unset beresp.http.Set-Cookie;
set beresp.ttl = 2h;
return (deliver);
} else if(bereq.url ~ "^(.*)\.(mp3|wma|mp4|rmvb|ogg|mov|avi|wmv|mpeg|mpg|dat|3pg|swf|flv|asf)($|\?)") {
unset beresp.http.Set-Cookie;
set beresp.ttl = 2h;
return (deliver);
}
if (beresp.ttl <= 0s ||
beresp.http.Set-Cookie ||
beresp.http.Surrogate-control ~ "no-store" ||
(!beresp.http.Surrogate-Control &&
beresp.http.Cache-Control ~ "no-cache|no-store|private") ||
beresp.http.Vary == "*") {
/*
* Mark as "Hit-For-Pass" for the next 2 minutes
*/
set beresp.ttl = 120s;
set beresp.uncacheable = true;
}
return (deliver);
}
参考文档：
https://varnish-cache.org/trac/wiki/VCLExamples
https://varnish-cache.org/docs/4.1/reference/index.html
https://varnish-cache.org/docs/4.1/users-guide/vcl-built-in-subs.html#vcl-built-in-subs
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