Support for If-None-Match header.

[Jan Hugo Prins | BetterBe]

What do you mean by "unless you want some very involved set"?
And sure, Varnish can ban objects when they become invalid, but then it
still needs to check the origin to see if the object is still valid.

Jan Hugo


On 01/23/2017 02:47 PM, Guillaume Quintard wrote:
> Hi,
>
> Short answer is : no, unless you want some very involved set.
>
> BUT, what you can do is: let varnish work its magic, and just ban
> objects based on ETAG when they become invalid.
>
> -- 
> Guillaume Quintard
>
> On Mon, Jan 23, 2017 at 1:56 PM, Jan Hugo Prins | BetterBe
> <jprins at betterbe.com <mailto:jprins at betterbe.com>> wrote:
>
>     Hello,
>
>     We are currently investigating the use of Varnish for our
>     infrastructure. In the software we build, we depend on the
>     If-None-Match header and the use of ETAG's.
>     The API we have created creates mainly JSON objects, and they
>     differ in size from a few hundreds of bytes to several megabytes.
>     A lot of these JSON objects are perfectly suited for caching,
>     until someone changes a parameter and this can happen at any
>     moment. That is also why we keep a record of all ETAG's and we
>     invalidate them when needed.
>
>     What we would like to do is cache created JSON object in front of
>     our production environment and when someone requests the same
>     calculation that someone else has requested before and the ETAG is
>     still valid, send out the cached object. But this basicly implies
>     the following workflow:
>
>
>
>     Somewhere I found an old Trac Wiki document that describes
>     something like this, but I can't figure out if this has been
>     implemented or not.
>     https://www.varnish-cache.org/trac/wiki/BackendConditionalRequests?version=8
>     <https://www.varnish-cache.org/trac/wiki/BackendConditionalRequests?version=8>
>
>     Could someone tell me if the workflow I describe is possible? My
>     first tests tell me that in the default setup it isn't working
>     like this.
>
>     Best regards,
>     Jan Hugo Prins
>
>
>
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>
>

-- 

Met vriendelijke groet / Best regards,

Jan Hugo Prins
/Infra and Storage consultant/

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