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<p>Hi <span>Maxim,</span></p>
<p><span><br>
</span></p>
<p><span>Thank so much for your response. You are correct, and the configuration of <span>proxy_cache_use_stale updating <span>was present.</span></span></span></p>
<p><span><span><span><br>
</span></span></span></p>
<p><span><span><span>Stale while revalidate is a great option, and we use in a websites with more than 50
<span>millions</span> users/<span>month</span>.</span></span></span></p>
<p><span><span><span><br>
</span></span></span></p>
<p><span><span><span>This graph is our time to waiting to delivery pages to our users. We implement stale while revalidate in the
<span>beginning of Mai and w<span>e had an improvement</span></span> <span>of 30%.</span></span></span></span></p>
<p><span><span><span><span><br>
</span></span></span></span></p>
<p><span><span><span><span><img size="61095" id="x_img286394" tabindex="0" style="max-width:99.9%" src="cid:179acb8c-85a4-4e56-ad12-b4953a6475bd"><br>
<br>
</span></span></span></span></p>
<p><br>
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<span style="color:black">Abraço,</span></p>
<p class="x_x_MsoNormal" style="margin:0cm 0cm 0.0001pt; font-size:11pt; font-family:Calibri,sans-serif; color:rgb(33,33,33)">
<b><span style="color:black">Rafael Cirolini</span></b></p>
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<span lang="EN-US">Sup Programmatic & Digital Services</span></p>
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<span style="color:black">Terra Global</span></p>
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<div id="x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>De:</b> nginx <nginx-bounces@nginx.org> em nome de Maxim Dounin <mdounin@mdounin.ru><br>
<b>Enviado:</b> quarta-feira, 7 de junho de 2017 11:26:45<br>
<b>Para:</b> nginx@nginx.org<br>
<b>Assunto:</b> Re: Stale While Revalidate Expires</font>
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<div class="PlainText">Hello!<br>
<br>
On Tue, Jun 06, 2017 at 07:33:24PM +0000, Rafael Cirolini wrote:<br>
<br>
> We've just updated to 1.12 to use the stale-while-revalidate option.<br>
> <br>
> The application is who sends the cache-control header, like this:<br>
> cache-control:max-age=180, stale-while-revalidate=60, stale-if-error=864000<br>
> <br>
> If I understood how SWR works, the user shouldn't receive stale content after 180+60 seconds.<br>
> <br>
> But we are seing stale content after this time.<br>
> X-Cache-Status: STALE<br>
> <br>
> Our DevOps team did a debug:<br>
> 2017/05/22 15:14:31 [debug] 21376#21376: *44 http file cache expired: 4 1495476646 1495476871<br>
> 2017/05/22 15:14:31 [debug] 21376#21376: *44 http upstream cache: 4<br>
> 2017/05/22 15:14:31 [debug] 21376#21376: *44 http file cache send: /var/cache/nginx/d/d2/fb19e1c85db7bda5c92ce21530bf5d2d<br>
> 2017/05/22 15:14:31 [debug] 21376#21376: *44 http ims:1491861925 lm:1491861925<br>
> 2017/05/22 15:14:31 [debug] 21376#21376: *44 http script var: "STALE"<br>
> <br>
> The correct answer should be EXPIRED after the max-age+SWR time.<br>
> <br>
> It looks reasonble to you?<br>
<br>
The behaviour depends on whether you use "proxy_cache_use_stale <br>
updating" in your configuration or not:<br>
<br>
- If it is explicitly configured, it takes precedence over <br>
"Cache-Control: stale-while-revalidate=", and nginx will use any <br>
stale response available.<br>
<br>
- If not configured, nginx will follow "stale-while-revalidate=" <br>
specified in the response.<br>
<br>
The debug log provided suggests that the configuration uses <br>
"proxy_cache_use_stale updating" and <br>
"proxy_cache_background_update on".<br>
<br>
-- <br>
Maxim Dounin<br>
<a href="http://nginx.org/">http://nginx.org/</a><br>
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