I'm not sure if this will help, but I ignore/hide a lot, this is in my config


proxy_ignore_headers X-Accel-Expires Expires Cache-Control Set-Cookie;
proxy_hide_header X-Accel-Expires;
proxy_hide_header Pragma;
proxy_hide_header Server;
proxy_hide_header Request-Context;
proxy_hide_header X-Powered-By;
proxy_hide_header X-AspNet-Version;
proxy_hide_header X-AspNetMvc-Version;


I have not experienced the problem you mention, I just thought I would offer my config.


___________________________________________

Michael Friscia

Office of Communications

Yale School of Medicine

(203) 737-7932 – office

(203) 931-5381 – mobile

http://web.yale.eduhttp://web.yale.edu/


________________________________
From: nginx <nginx-bounces@nginx.org> on behalf of Quintin Par <quintinpar@gmail.com>
Sent: Saturday, May 12, 2018 1:32 PM
To: nginx@nginx.org
Subject: Re: Debugging Nginx Cache Misses: Hitting high number of MISS despite high proxy valid



That’s the tricky part. These MISSes are intermittent. Whenever I run curl I get HITs but I end up seeing a lot of MISS in the logs.



How do I log these MiSSes with the reason? I want to know what headers ended up bypassing the cache.



Here’s my caching config



proxy_pass http://127.0.0.1:8000https://urldefense.proofpoint.com/v2/url?u=http-3A__127.0.0.1-3A8000&d=DwMFaQ&c=cjytLXgP8ixuoHflwc-poQ&r=wvXEDjvtDPcv7AlldT5UvDx32KXBEM6um_lS023SJrs&m=F-qGMOyS74uE8JM-dOLmNH92bQ1xQ-7Rj1d6k-_WST4&s=NHvlb1WColNwTWBF36P1whJdu5iWHK9_50IDHugaEdQ&e=;

proxy_set_header X-Real-IP $remote_addr;

proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

proxy_set_header X-Forwarded-Proto https;

proxy_set_header X-Forwarded-Port 443;



# If logged in, don't cache.

if ($http_cookie ~* "comment_author_|wordpress_(?!test_cookie)|wp-postpass_" ) {

set $do_not_cache 1;

}

proxy_cache_key "$scheme://$host$request_uri$do_not_cache";

proxy_cache staticfilecache;

add_header Cache-Control public;

proxy_cache_valid 200 120d;

proxy_hide_header "Set-Cookie";

proxy_ignore_headers "Set-Cookie";

proxy_ignore_headers "Cache-Control";

proxy_hide_header "Cache-Control";

proxy_pass_header X-Accel-Expires;



proxy_set_header Accept-Encoding "";

proxy_ignore_headers Expires;

add_header X-Cache-Status $upstream_cache_status;

proxy_cache_use_stale timeout;

proxy_cache_bypass $arg_nocache $do_not_cache;

- Quintin


On Sat, May 12, 2018 at 10:29 AM Lucas Rolff <lucas@lucasrolff.com<mailto:lucas@lucasrolff.com>> wrote:

It can be as simple as doing a curl to your “origin” url (the one you proxy_pass to) for the files you see that gets a lot of MISS’s – if there’s odd headers such as cookies etc, then you’ll most likely experience a bad cache if your nginx is configured to not ignore those headers.



From: nginx <nginx-bounces@nginx.org<mailto:nginx-bounces@nginx.org>> on behalf of Quintin Par <quintinpar@gmail.com<mailto:quintinpar@gmail.com>>
Reply-To: "nginx@nginx.org<mailto:nginx@nginx.org>" <nginx@nginx.org<mailto:nginx@nginx.org>>
Date: Saturday, 12 May 2018 at 18.26
To: "nginx@nginx.org<mailto:nginx@nginx.org>" <nginx@nginx.org<mailto:nginx@nginx.org>>
Subject: Debugging Nginx Cache Misses: Hitting high number of MISS despite high proxy valid



[https://mailtrack.io/trace/mail/86a613eb1ce46a4e7fa6f9eb96989cddae639800.png?u=74734]

My proxy cache path is set to a very high size



proxy_cache_path /var/lib/nginx/cache levels=1:2 keys_zone=staticfilecache:180m max_size=700m;

and the size used is only



sudo du -sh *

14M cache

4.0K proxy

Proxy cache valid is set to



proxy_cache_valid 200 120d;

I track HIT and MISS via



add_header X-Cache-Status $upstream_cache_status;

Despite these settings I am seeing a lot of MISSes. And this is for pages I intentionally ran a cache warmer an hour ago.



How do I debug why these MISSes are happening? How do I find out if the miss was due to eviction, expiration, some rogue header etc? Does Nginx provide commands for this?



- Quintin

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