server {
    listen 80
    server_name www.example.com;
    location / {
        proxy_pass http://127.0.0.1:800; #反向代理到varnish
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    }
}

server {
     listen 8080;
     server_name www.example.com;
     root /var/www/example;
}

 backend default {
     .host = "127.0.0.1";
     .port = "8080";
     .connect_timeout = 5s;
     .first_byte_timeout = 5s;
     .between_bytes_timeout = 5s;

}

sub vcl_recv {
     set req.backend=default;
     if (req.restarts == 0) {
        if (req.http.x-forwarded-for) {
            set req.http.X-Forwarded-For =
                req.http.X-Forwarded-For + ", " + client.ip;
        } else {
            set req.http.X-Forwarded-For = client.ip;
        }
     }
     if (req.request != "GET" &&
       req.request != "HEAD" &&
       req.request != "PUT" &&
       req.request != "POST" &&
       req.request != "TRACE" &&
       req.request != "OPTIONS" &&
       req.request != "DELETE") {
         /* Non-RFC2616 or CONNECT which is weird. */
         return (pipe);
     }
     if (req.request != "GET" && req.request != "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 (lookup);
 }

sub vcl_hit {
         #只要页面刷新(F5、CTRL+F5),页面的varnish cache均失效
        if(req.http.Cache-Control~"no-cache"||req.http.Cache-Control~"max-age=0"||req.http.Pragma~"no-cache"){
                set obj.ttl=0s;
                return (restart);
        }
     return (deliver);
 }

sub vcl_deliver {
        set resp.http.x-hits=obj.hits;
        if(obj.hits>0){
                set resp.http.X-Cache="hit";
        }
        else{
                set resp.http.X-Cache="MISS";
        }
     return (deliver);
 }

sub vcl_fetch {
     if (!beresp.cacheable) {
         return (pass);
     }
     if (beresp.http.Set-Cookie) {
         return (pass);
     }
#if(beresp.http.Pragma~"no-cache"||beresp.http.Cache-Control~"no-cache"||beresp.http.Cache-Control~"private"){
#        return (pass);
#    }

if(req.request=="GET"&&req.http.host~"bbs.xiazh.dev.aifang.com$"){
         set beresp.ttl=1200s;
     }
      if(req.request=="GET" && req.url~"\.(png|swf|txt|jpg|css|js|html|htm)$"){
         set beresp.ttl=3600s;
       }
          return (deliver);
 }