Caching but Cache Expire Time / purging does not work.

[astewart]

Hey guys,
I'm looking to go with the 2-CPU license for LSWS, I'm on the 15 day trial now but I can't seem to get the Caching to work properly. Well, actually the purging / Cache Expire Time.

First off I have a cPanel Server running Centos 6.4 without about 15 sites hosted off it.
Software versions:
PHP 5.4.17
LSWS 4.2.4

LSWS Cache Setting: (Globally disabled)

Enable Cache No
Cache Expire Time (seconds) Not Set
Cache Request with Query String Yes
Cache Request with Cookie Yes
Cache Response with Cookie Yes
Ignore Request Cache-Control Yes
Ignore Response Cache-Control Yes
Enable Private Cache No

So I plan on enabling cache by means of the .htaccess file only.
HTACCESS file contents:

<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
CacheEnable
RewriteCond %{ORG_REQ_URI} !^/wp-admin/
RewriteCond %{ORG_REQ_URI} !^/wp-admin$
RewriteRule ^index\.php$ - [L,E=Cache-Control:max-age=120]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>

I have successfully gotten cache enabled for one of my Wordpress sites but the Cache Expire Time / purging doesn't seem to happen in the amount of seconds I set it to, which is 120 seconds.

Here is what I get from doing the Curl test:

user@host [/]# curl -I http://www.stewartfamilypei.com/ HTTP/1.1 200 OK
Date: Wed, 23 Oct 2013 13:38:37 GMT
Server: LiteSpeed
Connection: Keep-Alive
Keep-Alive: timeout=5, max=100
Transfer-Encoding: chunked
[B]X-LiteSpeed-Cache: hit[/B]
X-Pingback: http://www.stewartfamilypei.com/xmlrpc.php
Expires: Wed, 11 Jan 1984 05:00:00 GMT
Cache-Control: [B]no-cache[/B], must-revalidate, max-age=0 (no-cache??)
Pragma: no-cache
Content-Type: text/html; charset=UTF-8

So it looks like it is caching fine but I'm not sure why the cache-control has no-cache. Besides that I have done the "test.php" test which has the time and date, to keep refreshing to watch it update in the proper amount of time but that cache page never seems to update.

Is it not taking into account the 120 seconds for this?

Any help would be great, as I would like to get this working properly.

Thanks guys!

Regards,

 

[NiteWave]

in .htaccess, replace

CacheEnable

with

Rewrite . - [E=Cache-Control:max-age=60]

see if any issue.

 

[astewart]

Hi Nitewave,
Unfortunately that didn't change a thing, it actually stops caching when I add that. This is what I have:

<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
Rewrite . - [E=Cache-Control:max-age=60]
RewriteCond %{ORG_REQ_URI} !^/wp-admin/
RewriteCond %{ORG_REQ_URI} !^/wp-admin$
RewriteRule ^index\.php$ - [L,E=Cache-Control:max-age=120]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>

It looks like the rewrite line you gave me is incorrect, as all it says is "Rewrite". Shouldn't that be "RewriteRule"?

Is there anything else I can try. I would love to stick with Litespeed but I may have to look at other avenues if I can't get the caching working right.

-- Adam S

 

[NiteWave]

It looks like the rewrite line you gave me is incorrect, as all it says is "Rewrite". Shouldn't that be "RewriteRule"?

you're right. Sorry, should be "RewriteRule". have you tried it ?

 

[astewart]

Yes, I have tried it.
It doesn't cache at all when I have that in there.

 

[NiteWave]

please change the rule to

RewriteRule (.*) - [E=Cache-Control:max-age=60]

what's your setting for Server->Cache
Storage Path
Max Object Size

 

[astewart]

I gave that a try and it didn't work either. Here is my current .htaccess file:

<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule (.*) - [E=Cache-Control:max-age=60]
RewriteCond %{ORG_REQ_URI} !^/wp-admin/
RewriteCond %{ORG_REQ_URI} !^/wp-admin$
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>

Here is what I have for storage and max object size:
Storage Path: /dev/shm/diskcache
Max Object Size: 118600

As mentioned in my first post with the .htaccess I originally posted, I was able to get items to cache but they were not refreshing.

For now I have implemented a temporary work around so that ALL cache is removed every 5 minutes:

*/5 * * * * find /dev/shm/diskcache -type f -mmin +5 -delete 2>/dev/null

I would rather the cache expires per site though and not set at a global level.

 

[NiteWave]

I re-read your first post:

Is it not taking into account the 120 seconds for this?

it's because in global setting:
Cache Expire Time (seconds) Not Set

if you set to 120 seconds, then it'll work as expected.

Cache-Control: no-cache, must-revalidate, max-age=0 (no-cache??)

this header is generated by php. since global setting
Ignore Response Cache-Control Yes
so it's ignored by lsws, just pass it as it is.
only this header
X-LiteSpeed-Cache: hit
is generated by litespeed, and indicate it's a cached page.

so that ALL cache is removed every 5 minutes

to be accurate, all cache generated 5 minutes ago are removed.

 

[astewart]

You are correct when you say the cron runs every five minutes and removes all cached objects that are older then 5 minutes

What I;m trying to find out here is if I have "Ignore Response Cache-Control Yes", then isn't there a way to set the expire time in the .htaccess file?

As an example, shouldn't "RewriteRule (.*) - [E=Cache-Control:max-age=60]" set the the cache expire time to 60 seconds. Once the 60 seconds is up it creates a new cached file?

Do you see what I mean?

 

[NiteWave]

Once the 60 seconds is up it creates a new cached file?

of course it will. but won't be automatically, only when receive an new request, it'll check if the cache is there and not expire. if not expire, will return the cache. if cache not exist or already expire, it'll pass the request to backend php process and get the response from it. then replace the old cache with the new response.

 

[astewart]

And this is my problem. It is not replacing the expired cache.

I have tried with each of the following one at a time and still the cache doesn't expire in 60:

RewriteRule ^index\.php$ - [L,E=Cache-Control:max-age=60]

RewriteRule . - [E=Cache-Control:max-age=60]

RewriteRule ^index\.php$ - [L,E=Cache-Control:max-age=60]

RewriteRule (.*) - [E=Cache-Control:max-age=60]

RewriteRule /(.*\.php)?$ – [L,E=Cache-Control:max-age=60]

RewriteRule /(.*\.php)?$ – [E=Cache-Control:max-age=60,L]

None of the above worked. The cache never expires and is never refreshed

 

[NiteWave]

please create a test case so that other can reproduce it

you can create a test.php which only show timestamp.

the rewriterule can be
RewriteRule ^test.php$ - [E=Cache-Control:max-age=60]

use
#curl -i domain/test.php

to check the result. test in after 30 seconds, 60 seconds, 100 seconds etc.
post the result here.