May I know if there is any way to find the best possible TTL? I meant to ask for uncacheable objects
*Thanks & Regards,* *Uday Kumar* On Tue, Jun 11, 2024 at 4:11 PM Uday Kumar <[email protected]> wrote: > Hello Guillaume, > We have made required changes at our end, but we have doubt on giving > suitable TTL for uncacheable objects > > if (beresp.http.Cache-Control ~ "no-cache") { > set beresp.ttl = *doubt*; > set beresp.uncacheable = true; > } > > FYI; > we have ttl of 24hrs for normal objects which are cacheable > > May I know if there is any way to find the best possible TTL? > > *Thanks & Regards,* > *Uday Kumar* > > > On Tue, May 28, 2024 at 7:07 PM Uday Kumar <[email protected]> > wrote: > >> Hello Guillaume, >> Great to know about this, it should work for us! >> will check this out >> >> *Thanks & Regards,* >> *Uday Kumar* >> >> >> On Tue, May 28, 2024 at 5:53 PM Guillaume Quintard < >> [email protected]> wrote: >> >>> Hi Uday, >>> >>> Sure, the classic practice will do nicely: >>> >>> sub vcl_backend_response { >>> if (beresp.http.that-specific-header) { >>> # TTL should match the time during which that header is unlikely >>> to change >>> # do NOT set it to 0s or less ( >>> https://info.varnish-software.com/blog/hit-for-miss-and-why-a-null-ttl-is-bad-for-you >>> ) >>> set beresp.ttl = 2m; >>> set beresp.uncacheable = true; >>> return (deliver); >>> } >>> } >>> >>> The main trick here is beresp.uncacheable, you do not have to return >>> immediately if you still have modifications/checks to do on that response. >>> >>> Would that work for you? >>> >>> -- >>> Guillaume Quintard >>> >>> >>> On Tue, May 28, 2024 at 4:55 AM Uday Kumar <[email protected]> >>> wrote: >>> >>>> Hello all, >>>> >>>> We need to prevent caching in Varnish based on a specific header from >>>> the backend. >>>> >>>> Could you please suggest the best approach to achieve this? >>>> >>>> >>>> *Thanks & Regards,* >>>> *Uday Kumar* >>>> _______________________________________________ >>>> varnish-misc mailing list >>>> [email protected] >>>> https://www.varnish-cache.org/lists/mailman/listinfo/varnish-misc >>>> >>>
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