Wordpress Configure Redis page cache to bypass specific urls

Well, I am using a download manager plugin to share some pdf files from my site.
The problem is that when someone tries to download a file the url used is something like domain.com/download/?down=23 which is served through Redis cache and the Nginx Timestamp is added at the source of the pdf!

Is there a way to bypass all urls with ?down= variable from redis cache?

I am using:
123.09beta01 (latest)
PHP 7.2.12
nginx 1.15.6

---

Sorry for my bad english

Thanks,
Savvas

 

Hi eva2000,

Unfortunately your solution is not working

My actual url format is something like this:
domain.com/download/file-name/?wpdmdl=xxxxxxx

So I added the following code :

Code:

# Don't use the cache for download links
if ($request_uri ~* "\?wpdmdl=") {
  set $skip_cache 1;
}

but it keeps adding

Code:

<!--Cached using Nginx-Helper on 2018-11-30 07:05:48. It took 55 queries executed in 0,109 seconds.-->
<!--Visit http://wordpress.org/extend/plugins/nginx-helper/faq/ for more details-->

at the end of pdf files

 

Unfortunately no joy...

Code:

<!--Cached using Nginx-Helper on 2018-11-30 10:28:11. It took 54 queries executed in 0,124 seconds.-->
<!--Visit http://wordpress.org/extend/plugins/nginx-helper/faq/ for more details-->

 

Still not working. Maybe the problem is in Nginx-Helper plugin?

 

Hi there eva2000,

Sorry for the long delay on reply

After some more in depth investigation, it seems that when someone wants to download something from my website and the user is using an Apple Device (Mac or iPhone or iPad), the file is not dowloading completely. It seems to stop downloading at 99% and gives an error "The network connection was lost".

I try to figure out what the exact problem was and I did the following:
I create a new VPS at digitalocean ($5) and install Centmimod 123.09beta. I then create a website through menu 22 and select the 2nd option (Redis Nginx Level Caching). I then migrate my live site, to this new testing host. So I have the same plugins in both sites! In my Original Site, the files are not downloaded correctly in Apple Devices, but in my Testing Site everything is working just perfect!

So the problem doesnt seem to be at the cache mechanism after all

The question is, how can I check what is the difference between the configuration of these sites? What files should I check?

Thanks,
Savvas

 

Hi there eva2000,

Well I follow your second suggestion, move the site to the new VPS instance and guess what. It is not working again

It is hard to investigate what exactly is going wrong because I don't have an Apple device. I try to install a MacOs on Virtual Box and discover that if you try to download a file from Safari, the downloading failed with "The network connection was lost". Then I try to install Chrome and use that one. Everything worked like magic! The problem is that I still don't know what is the cause of the problem, and I am getting everyday complaints from Apple users that they cannot download any file from my site.

I will propose them to try a different browser, but still is a very strange behaviour...

Thanks,
Savvas

 

The truth is that I tried it and the problem was insisting. Thats why I return to redis cache, because I think it is more optimized.
I am not sure that the problem is with the cache after all. Is it possible some http headers to make this whole mess?
My first page headers are the following:

Code:

HTTP/1.1 200 OK
Date: Mon, 28 Jan 2019 07:18:27 GMT
Content-Type: text/html; charset=UTF-8
Connection: keep-alive
Vary: Accept-Encoding
Set-Cookie: PHPSESSID=vmhu0enmjm8cl6ghjoon0llsou; path=/
Expires: Thu, 19 Nov 1981 08:52:00 GMT
Cache-Control: no-store, no-cache, must-revalidate
Pragma: no-cache
Link: https://www.themata4all.com/wp-json/; rel=https://api.w.org/
Link: https://wp.me/6LYH3; rel=shortlink
Server: nginx centminmod
X-Powered-By: centminmod
X-Cache: MISS
X-Cache-2: BYPASS
X-Xss-Protection: 1; mode=block
X-Content-Type-Options: nosniff

Thanks

 

Well,

My files are mostly pdf files with average size of 200-300kb, nothing special here.

Well I am not 100% sure but I think that I answered NO

Unfortunately I deleted my old VPS

Below are my themata4all.com.ssl.conf contents. I dont have themata4all.com.conf (probably because I selected to use ONLY HTTPS?)

Code:

#x# HTTPS-DEFAULT
 server {
  
   server_name themata4all.com www.themata4all.com;
   return 302 https://www.themata4all.com$request_uri;
   include /usr/local/nginx/conf/staticfiles.conf;
 }

server {
  listen 443 ssl http2 reuseport;
  server_name themata4all.com www.themata4all.com;

  include /usr/local/nginx/conf/ssl/themata4all.com/themata4all.com.crt.key.conf;
  include /usr/local/nginx/conf/ssl_include.conf;

  # cloudflare authenticated origin pull cert community.centminmod.com/threads/13847/
  #ssl_client_certificate /usr/local/nginx/conf/ssl/cloudflare/themata4all.com/origin.crt;
  #ssl_verify_client on;
  http2_max_field_size 16k;
  http2_max_header_size 32k;
  # mozilla recommended
  ssl_ciphers XXXXXXXX;
  ssl_prefer_server_ciphers   on;
  #add_header Alternate-Protocol  443:npn-spdy/3;

  # before enabling HSTS line below read centminmod.com/nginx_domain_dns_setup.html#hsts
  #add_header Strict-Transport-Security "max-age=31536000; includeSubdomains;";
  #add_header X-Frame-Options SAMEORIGIN;
  add_header X-Xss-Protection "1; mode=block" always;
  add_header X-Content-Type-Options "nosniff" always;
  #add_header Referrer-Policy "strict-origin-when-cross-origin";
  #spdy_headers_comp 5;
  ssl_buffer_size 1369;
  ssl_session_tickets on;
 
  # enable ocsp stapling
  resolver 8.8.8.8 8.8.4.4 valid=10m;
  resolver_timeout 10s;
  ssl_stapling on;
  ssl_stapling_verify on;

# ngx_pagespeed & ngx_pagespeed handler
#include /usr/local/nginx/conf/pagespeed.conf;
#include /usr/local/nginx/conf/pagespeedhandler.conf;
#include /usr/local/nginx/conf/pagespeedstatslog.conf;

  # limit_conn limit_per_ip 16;
  # ssi  on;

  access_log /home/nginx/domains/themata4all.com/log/access.log combined buffer=256k flush=5m;
  error_log /home/nginx/domains/themata4all.com/log/error.log;

  include /usr/local/nginx/conf/autoprotect/themata4all.com/autoprotect-themata4all.com.conf;
  root /home/nginx/domains/themata4all.com/public;
  # uncomment cloudflare.conf include if using cloudflare for
  # server and/or vhost site
  #include /usr/local/nginx/conf/cloudflare.conf;
  include /usr/local/nginx/conf/503include-main.conf;

  #include /usr/local/nginx/conf/wpincludes/themata4all.com/wpcacheenabler_themata4all.com.conf;
  #include /usr/local/nginx/conf/wpincludes/themata4all.com/wpsupercache_themata4all.com.conf;
  # https://community.centminmod.com/posts/18828/
  include /usr/local/nginx/conf/wpincludes/themata4all.com/rediscache_themata4all.com.conf; 

  location / {
  include /usr/local/nginx/conf/503include-only.conf;
 

  # Enables directory listings when index file not found
  #autoindex  on;

  # for wordpress super cache plugin
  #try_files /wp-content/cache/supercache/$http_host/$cache_uri/index.html $uri $uri/ /index.php?q=$uri&$args;

  # for wp cache enabler plugin
  #try_files $cache_enabler_uri $uri $uri/ $custom_subdir/index.php?$args; 

  # Wordpress Permalinks
  #try_files $uri $uri/ /index.php?q=$uri&$args;

  # Nginx level redis Wordpress
  # https://community.centminmod.com/posts/18828/
  try_files $uri $uri/ /index.php?$args;

  }

location ~* /(wp-login\.php) {
    limit_req zone=xwplogin burst=1 nodelay;
    #limit_conn xwpconlimit 30;
    #auth_basic "Private";
    #auth_basic_user_file /home/nginx/domains/themata4all.com/htpasswd_wplogin;   
    #include /usr/local/nginx/conf/php-wpsc.conf;
    
    # https://community.centminmod.com/posts/18828/
    include /usr/local/nginx/conf/php-rediscache.conf;
}

location ~* /(xmlrpc\.php) {
    limit_req zone=xwprpc burst=45 nodelay;
    #limit_conn xwpconlimit 30;
    #include /usr/local/nginx/conf/php-wpsc.conf;
    
    # https://community.centminmod.com/posts/18828/
    include /usr/local/nginx/conf/php-rediscache.conf;
}

location ~* /wp-admin/(load-scripts\.php) {
    limit_req zone=xwprpc burst=5 nodelay;
    #limit_conn xwpconlimit 30;
    #include /usr/local/nginx/conf/php-wpsc.conf;
    
    # https://community.centminmod.com/posts/18828/
    include /usr/local/nginx/conf/php-rediscache.conf;
}

location ~* /wp-admin/(load-styles\.php) {
    limit_req zone=xwprpc burst=5 nodelay;
    #limit_conn xwpconlimit 30;
    #include /usr/local/nginx/conf/php-wpsc.conf;
    
    # https://community.centminmod.com/posts/18828/
    include /usr/local/nginx/conf/php-rediscache.conf;
}

  include /usr/local/nginx/conf/wpincludes/themata4all.com/wpsecure_themata4all.com.conf;
  #include /usr/local/nginx/conf/php-wpsc.conf;
 
  # https://community.centminmod.com/posts/18828/
  include /usr/local/nginx/conf/php-rediscache.conf;
  include /usr/local/nginx/conf/pre-staticfiles-local-themata4all.com.conf;
  include /usr/local/nginx/conf/pre-staticfiles-global.conf;
  include /usr/local/nginx/conf/staticfiles.conf;
  include /usr/local/nginx/conf/drop.conf;
  #include /usr/local/nginx/conf/errorpage.conf;
  include /usr/local/nginx/conf/vts_server.conf;
}

Code:

[07:42][xxx@xxxx ~]# curl -I https://themata4all.com
HTTP/1.1 301 Moved Permanently
Date: Tue, 29 Jan 2019 05:42:56 GMT
Content-Type: text/html; charset=UTF-8
Connection: keep-alive
Set-Cookie: PHPSESSID=2033ok4g4rreq7oo586jdlf94f; path=/
Expires: Thu, 19 Nov 1981 08:52:00 GMT
Cache-Control: no-store, no-cache, must-revalidate
Pragma: no-cache
Location: https://www.themata4all.com/
Server: nginx centminmod
X-Powered-By: centminmod
X-Cache: MISS
X-Cache-2: BYPASS
X-Xss-Protection: 1; mode=block
X-Content-Type-Options: nosniff

[07:42][xxx@xxx ~]# curl -I https://www.themata4all.com
HTTP/1.1 200 OK
Date: Tue, 29 Jan 2019 05:43:08 GMT
Content-Type: text/html; charset=UTF-8
Connection: keep-alive
Vary: Accept-Encoding
Set-Cookie: PHPSESSID=9uq1lghjdel7gq687ql0pt19ec; path=/
Expires: Thu, 19 Nov 1981 08:52:00 GMT
Cache-Control: no-store, no-cache, must-revalidate
Pragma: no-cache
Link: <https://www.themata4all.com/wp-json/>; rel="https://api.w.org/"
Link: <https://wp.me/6LYH3>; rel=shortlink
Server: nginx centminmod
X-Powered-By: centminmod
X-Cache: MISS
X-Cache-2: BYPASS
X-Xss-Protection: 1; mode=block
X-Content-Type-Options: nosniff

[07:43][xxx@xxx ~]# curl -I http://themata4all.com
HTTP/1.1 302 Moved Temporarily
Date: Tue, 29 Jan 2019 05:43:27 GMT
Content-Type: text/html
Content-Length: 138
Connection: keep-alive
Location: https://www.themata4all.com/
Server: nginx centminmod
X-Powered-By: centminmod

[07:43][xxx@xxx ~]# curl -I http://www.themata4all.com
HTTP/1.1 302 Moved Temporarily
Date: Tue, 29 Jan 2019 05:43:40 GMT
Content-Type: text/html
Content-Length: 138
Connection: keep-alive
Location: https://www.themata4all.com/
Server: nginx centminmod
X-Powered-By: centminmod

 

I finally identify the issue (I hope at least) I manage to install a MacOS on a VirtualBox and with the trial and error I manage to find it

I had to disable the "Resumable Downloads" and "Output Buffering" options from Download Manager options (https://snag.gy/SJhLgo.jpg)

Somehow it was confusing Safari browsers on MacOS (and iOS hopefully) browsers.

I will wait for any user feedback

Thanks a lot eva2000 for your help!