Varnish Prefetch

[Paras Fadte]

Hi,

Is prefetch by default enabled in varnish ?  I have following in VCL . A
value of -30 seconds would mean that the object would be checked 30 seconds
before its expiry time is reached to see if its modified on backend ?


sub vcl_fetch {
    set obj.grace = 30s;
    if (!obj.cacheable) {
        pass;
    }
    if (obj.http.Set-Cookie) {
        pass;
    }
    set obj.prefetch =  -30s;
    deliver;
}


I see following from varnishlog . What doe that mean ?

26 VCL_info     c XID 3904284923: obj.prefetch (-30) less than ttl
(-1.26414e+09), ignored.

0 VCL_call     - prefetch
0 ExpPick      - 3903448954 prefetch



Thank you.

-Paras
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