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?
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.
Thank you for your help, it's much appreciated.
On 25/07/2017 02:35, Zhang Chao wrote:
Hi!
Have you used the proxy_cache_valid
<http://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_cache_valid>?
Maybe you can add this directive to disable the 304 cache explicitly.
|proxy_cache_valid 304 0;|
On 24 July 2017 at 23:20:35, Ryan Barclay ([email protected]
<mailto:[email protected]>) wrote:
We have a pretty simple setup with NGINX sitting on the front and a
backend server (on a separate physical server) that provides the
content.
Nginx then caches content based on the EXPIRES and Cache-Control headers
set by the origin server.
We noticed that NGINX was not issuing 304 headers to images that were
not in the local NGINX cache when the If-Modified-Since header was sent
by the client. Instead, it would issue a 200 with the full data file.
To fix this, we applied:
proxy_set_header If-Modified-Since $http_if_modified_since
So then the If-Modified-Since header was passed to the backend and of
course, it returned correctly with the 304 header - great.
But what we noticed was that NGINX would cache this 304 response and
deliver future responses as 304 to clients even without the
If-Modified-Since header.
How can we disable caching of 304 responses and fix this issue?
Thank you for your help, suggestions, and tips in advance.
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