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<p>That's an interesting solution. Would nginx still cache our
other items as normal using this config? We specify cache
settings via Cache-Control and Expires headers sent from the
origin server. Also, we are using X-Accel-Expires for some pages
which are sent from the origin server too. This wouldn't affect
any of our caching? It would simply not cache any resources with
304 sent from the origin?</p>
<p>Another thought... would proxy_cache_valid override the Expires /
Cache-Control headers sent along with the 304 response from the
origin server? Because with these 304 responses, the origin
server sets a 3 month expires.<br>
</p>
<p>Thank you for your help, it's much appreciated.</p>
<p><br>
</p>
<p><br>
</p>
<div class="moz-cite-prefix">On 25/07/2017 02:35, Zhang Chao wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAPr95Bivg4oqev5NHk6JwkU8wx6hXwx2ZPPru_uYtTH+GiYnyg@mail.gmail.com">
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<div class="bloop_markdown">
<p>Hi!</p>
<p>Have you used the <a
href="http://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_cache_valid"
moz-do-not-send="true">proxy_cache_valid</a>?</p>
<p>Maybe you can add this directive to disable the 304 cache
explicitly.</p>
<pre><code class="nginx">proxy_cache_valid 304 0;</code></pre>
</div>
<div class="bloop_original_html">
<div class="bloop_original_html">
<div class="bloop_original_html"> <br>
<p class="airmail_on">On 24 July 2017 at 23:20:35, Ryan
Barclay (<a href="mailto:ryan@rbftpnetworks.com"
moz-do-not-send="true">ryan@rbftpnetworks.com</a>)
wrote:</p>
<blockquote type="cite" class="clean_bq"><span>
<div>
<div>We have a pretty simple setup with NGINX sitting
on the front and a <br>
backend server (on a separate physical server) that
provides the content.
<br>
<br>
Nginx then caches content based on the EXPIRES and
Cache-Control headers <br>
set by the origin server.
<br>
<br>
We noticed that NGINX was not issuing 304 headers to
images that were <br>
not in the local NGINX cache when the
If-Modified-Since header was sent <br>
by the client. Instead, it would issue a 200 with
the full data file.
<br>
<br>
To fix this, we applied:
<br>
proxy_set_header If-Modified-Since
$http_if_modified_since
<br>
<br>
So then the If-Modified-Since header was passed to
the backend and of <br>
course, it returned correctly with the 304 header -
great.
<br>
<br>
But what we noticed was that NGINX would cache this
304 response and <br>
deliver future responses as 304 to clients even
without the <br>
If-Modified-Since header.
<br>
<br>
How can we disable caching of 304 responses and fix
this issue?
<br>
<br>
Thank you for your help, suggestions, and tips in
advance.
<br>
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nginx mailing list
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moz-do-not-send="true">nginx@nginx.org</a>
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</div>
</span></blockquote>
</div>
</div>
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<fieldset class="mimeAttachmentHeader"></fieldset>
<br>
<pre wrap="">_______________________________________________
nginx mailing list
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<a class="moz-txt-link-freetext" href="http://mailman.nginx.org/mailman/listinfo/nginx">http://mailman.nginx.org/mailman/listinfo/nginx</a></pre>
</blockquote>
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