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What do you mean by "unless you want some very involved set"?<br>
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.<br>
<br>
Jan Hugo<br>
<br>
<br>
<div class="moz-cite-prefix">On 01/23/2017 02:47 PM, Guillaume
Quintard wrote:<br>
</div>
<blockquote
cite="mid:CAJ6ZYQwAt51T1zVXQknej4HsKDzJV1KnCN+vJvRzZnKzwSKNZw@mail.gmail.com"
type="cite">
<div dir="ltr">Hi,
<div><br>
</div>
<div>Short answer is : no, unless you want some very involved
set.</div>
<div><br>
</div>
<div>BUT, what you can do is: let varnish work its magic, and
just ban objects based on ETAG when they become invalid.</div>
</div>
<div class="gmail_extra"><br clear="all">
<div>
<div class="gmail_signature" data-smartmail="gmail_signature">
<div dir="ltr">
<div>-- <br>
</div>
Guillaume Quintard<br>
</div>
</div>
</div>
<br>
<div class="gmail_quote">On Mon, Jan 23, 2017 at 1:56 PM, Jan
Hugo Prins | BetterBe <span dir="ltr"><<a
moz-do-not-send="true" href="mailto:jprins@betterbe.com"
target="_blank">jprins@betterbe.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div text="#000000" bgcolor="#FFFFFF"> Hello,<br>
<br>
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.<br>
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. <br>
<br>
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:<br>
<br>
<img src="cid:part2.EE728773.253AF437@betterbe.com" alt=""><br>
<br>
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.<br>
<a moz-do-not-send="true"
class="m_-7398062104745155830moz-txt-link-freetext"
href="https://www.varnish-cache.org/trac/wiki/BackendConditionalRequests?version=8"
target="_blank">https://www.varnish-cache.org/<wbr>trac/wiki/<wbr>BackendConditionalRequests?<wbr>version=8</a><br>
<br>
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.<br>
<br>
Best regards,<br>
Jan Hugo Prins<br>
<br>
<br>
</div>
<br>
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href="https://www.varnish-cache.org/lists/mailman/listinfo/varnish-misc"
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</blockquote>
</div>
<br>
</div>
</blockquote>
<br>
<div class="moz-signature">-- <br>
<p style="font-family: Arial,Roboto;font-size: 13px;color:
#000000;line-height:
20px;margin:0px;margin-top:20px;margin-bottom:50px;"> Met
vriendelijke groet / Best regards,<br>
<br>
Jan Hugo Prins<br>
<i>Infra and Storage consultant</i>
</p>
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