# Blank page on some micro-cached pages **URL:** \ **Category:** NGINX\ **Created:** [November 23, 2013, 11:01am UTC](https://www.ruby-forum.com/t/blank-page-on-some-micro-cached-pages/237671 "2013-11-23T11:01:39Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![musicdenotation](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/ea666f/32.png) [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Post date:** [November 23, 2013, 11:01am UTC](https://www.ruby-forum.com/t/blank-page-on-some-micro-cached-pages/237671/1 "2013-11-23T11:01:39Z")
Running Nginx 1.5.7 on Freebsd 9.1 with php-pfm 5.5.3 a wordpress site is “micro-cached” , but for some strange reason and not always , some pages ( wordpress post or pages even 3 or 7 days after their publication) are rendered for some users ( me and others and not always the same, with different browsers) as blank pages and the same connexion can read other cached pages/post with no problems. The size of the global site in /cache is 72 Kb. Very small indeed. The bad cached pages are logged like this : “GET /url HTTP/1.1” 200 31 always 200 as a result code, and 31 for its size… 31 is not the actual size of the page of course. If a refresh my local cache ( SHIFT CMD-R) on chrome , the correct page is reloaded and cached in /cache/x/y/somefile by nginx. Any help ? Some config : fastcgi\_cache\_path /cache/nginx levels=1:2 keys\_zone=microcache:5m max\_size=2000m; sendfile on; sendfile\_max\_chunk 512K; aio sendfile; tcp\_nopush on; read\_ahead 256K; open\_file\_cache max=1000 inactive=20s; open\_file\_cache\_valid 30s; open\_file\_cache\_min\_uses 2; open\_file\_cache\_errors on; keepalive\_timeout 120; keepalive\_requests 10000; client\_max\_body\_size 2m; gzip on; gzip\_buffers 48 8k; gzip\_comp\_level 4; gzip\_http\_version 1.0; gzip\_vary on; gzip\_disable “MSIE [1-6].(?!.\*SV1)”; gzip\_proxied any; gzip\_types text/plain text/css application/x-javascript text/xml application/xml application/xml+rss text/javascript; ---
**Author:** ![istos](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/i/8797f3/32.png) [@istos](https://www.ruby-forum.com/u/istos)\ **Post date:** [November 25, 2013, 3:14pm UTC](https://www.ruby-forum.com/t/blank-page-on-some-micro-cached-pages/237671/2 "2013-11-25T15:14:00Z")
Hello! On Sat, Nov 23, 2013 at 11:00:52AM +0100, Ronald Van A. wrote: > The size of the global site in /cache is 72 Kb. Very small > nginx. > > Any help ? Size is suspiciously small, and I would suggest it’s some error returned by php. You may try adding $upstream\_cache\_status to access log to get some more details (likely there will be MISS or similar state there, indicating the response was returned by a php). If it doesn’t help, some more hints about debugging can be found here: > **[Debugging | NGINX](https://www.nginx.com/resources/wiki/start/topics/tutorials/debugging/)** > > This tutorial explains how to use some of NGINX's essential debugging features. – Maxim D. [http://nginx.org/en/donation.html](http://nginx.org/en/donation.html) ---
**Author:** ![istos](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/i/8797f3/32.png) [@istos](https://www.ruby-forum.com/u/istos)\ **Post date:** [November 25, 2013, 4:48pm UTC](https://www.ruby-forum.com/t/blank-page-on-some-micro-cached-pages/237671/3 "2013-11-25T16:48:04Z")
It seems related to every update on a post and the use of the WP plugin Nginx-Helper if i add $upstream\_cache\_status to the log format , nothing is logged. Should i recompile Nginx 1.5 with some additional modules ? On the Freebsd port we have : [] HTTP\_UPSTREAM\_FAIR 3rd party upstream fair module [] HTTP\_UPSTREAM\_HASH 3rd party upstream hash module [] HTTP\_UPSTREAM\_STICKY 3rd party upstream sticky module which do I have to select ? Le 25 nov. 2013 15:13, Maxim D. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) a crit : ---
**Author:** ![istos](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/i/8797f3/32.png) [@istos](https://www.ruby-forum.com/u/istos)\ **Post date:** [November 25, 2013, 5:11pm UTC](https://www.ruby-forum.com/t/blank-page-on-some-micro-cached-pages/237671/4 "2013-11-25T17:11:29Z")
Hello! On Mon, Nov 25, 2013 at 04:47:04PM +0100, Ronald Van A. wrote: > It seems related to every update on a post and the use of the WP plugin > Nginx-Helper From a description of the plugin, it looks like it is expected to work with 3rd party cache purge module. It may explain things if you don’t have the module compiled. Just switching off the pluging is probably a best solution. > if i add $upstream\_cache\_status to the log format , nothing is logged. > Should i recompile Nginx 1.5 with some additional modules ? > > On the Freebsd port we have : > > [] HTTP\_UPSTREAM\_FAIR 3rd party upstream fair module > [] HTTP\_UPSTREAM\_HASH 3rd party upstream hash module > [] HTTP\_UPSTREAM\_STICKY 3rd party upstream sticky module > > which do I have to select ? You don’t need these modules. If $upstream\_cache\_status isn’t logged, it’s most likely a problem in your configuration - e.g., the log format you’ve modified isn’t used by your access\_log directive. – Maxim D. [http://nginx.org/en/donation.html](http://nginx.org/en/donation.html) ---
**Author:** ![istos](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/i/8797f3/32.png) [@istos](https://www.ruby-forum.com/u/istos)\ **Post date:** [November 25, 2013, 5:24pm UTC](https://www.ruby-forum.com/t/blank-page-on-some-micro-cached-pages/237671/5 "2013-11-25T17:24:56Z")
Well nginx 1.5.7 is compiled with this 3 party module : configure arguments: --prefix=/usr/local/etc/nginx --with-cc-opt=‘-I /usr/local/include’ --with-ld-opt=‘-L /usr/local/lib’ –conf-path=/usr/local/etc/nginx/nginx.conf –sbin-path=/usr/local/sbin/nginx --pid-path=/var/run/nginx.pid –error-log-path=/var/log/nginx-error.log --user=www --group=www –with-file-aio --with-ipv6 –http-client-body-temp-path=/var/tmp/nginx/client\_body\_temp –http-fastcgi-temp-path=/var/tmp/nginx/fastcgi\_temp –http-proxy-temp-path=/var/tmp/nginx/proxy\_temp –http-scgi-temp-path=/var/tmp/nginx/scgi\_temp –http-uwsgi-temp-path=/var/tmp/nginx/uwsgi\_temp –http-log-path=/var/log/nginx-access.log –add-module=/usr/ports/www/nginx-devel/work/ngx\_cache\_purge-2.1 –with-http\_geoip\_module --with-http\_stub\_status\_module --with-pcre Le 25 nov. 2013 17:11, Maxim D. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) a crit : ---
**Author:** ![istos](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/i/8797f3/32.png) [@istos](https://www.ruby-forum.com/u/istos)\ **Post date:** [November 25, 2013, 5:12pm UTC](https://www.ruby-forum.com/t/blank-page-on-some-micro-cached-pages/237671/6 "2013-11-25T17:12:40Z")
Oups anwser to myself : ADDED the $upstream\_cache\_status to the LOG : the page are empty , still a 200 RESULT CODE and a HIT with a 31 byte size. myIP - - [25/Nov/2013:17:04:35 +0100] “GET /allairgoo HTTP/1.1” 200 HIT 31 “[http://truc/](http://truc/)” " Mozilla/5.0 (Macintosh; Intel Mac OS X 10\_9\_0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.57 Safari/537.36" “-” myIP - - [25/Nov/2013:17:04:50 +0100] “GET /allairgoo HTTP/1.1” 200 HIT 31 “[http://truc/](http://truc/)” " Mozilla/5.0 (Macintosh; Intel Mac OS X 10\_9\_0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.57 Safari/537.36" “-” Le 25 nov. 2013 16:47, Ronald Van A. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) a crit : ---
**Author:** ![istos](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/i/8797f3/32.png) [@istos](https://www.ruby-forum.com/u/istos)\ **Post date:** [November 25, 2013, 9:46pm UTC](https://www.ruby-forum.com/t/blank-page-on-some-micro-cached-pages/237671/7 "2013-11-25T21:46:06Z")
Hello! On Mon, Nov 25, 2013 at 05:24:32PM +0100, Ronald Van A. wrote: > Well nginx 1.5.7 is compiled with this 3 party module : > > configure arguments: --prefix=/usr/local/etc/nginx --with-cc-opt=‘-I > /usr/local/include’ --with-ld-opt=‘-L /usr/local/lib’ > –conf-path=/usr/local/etc/nginx/nginx.conf --sbin-path=/usr/local/sbin/nginx > –pid-path=/var/run/nginx.pid --error-log-path=/var/log/nginx-error.log --user=www > –group=www --with-file-aio --with-ipv6 > –http-client-body-temp-path=/var/tmp/nginx/client\_body\_temp > –http-fastcgi-temp-path=/var/tmp/nginx/fastcgi\_temp > –http-proxy-temp-path=/var/tmp/nginx/proxy\_temp > –http-scgi-temp-path=/var/tmp/nginx/scgi\_temp > –http-uwsgi-temp-path=/var/tmp/nginx/uwsgi\_temp > –http-log-path=/var/log/nginx-access.log > –add-module=/usr/ports/www/nginx-devel/work/ngx\_cache\_purge-2.1 > –with-http\_geoip\_module --with-http\_stub\_status\_module --with-pcre So the cache purge is compiled in. It may need to be configured to work properly with Nginx-Helper plugin though, take a look at plugin docs. I suspect the reason for small responses returned from cache (as your other messages indicate) is a special purge request which isn’t handled cache purge module but passed back to php, and an error message returned is cached. As already suggested, if you are not familiar with nginx configuration it might be good idea to just switch off the plugin. – Maxim D. [http://nginx.org/en/donation.html](http://nginx.org/en/donation.html)