1. maintain a persistent cache for applications that do not have a shared cache.
2. maintain a private persistent cache for specific groups of documents that are not to be shared among other applications.

1. LSWS Web Admin Console->Server->Cache
2. Cache Storage Settings->Storage Path: set to a fast local disk, e.g. /tmp/diskcache (set it to a ramdisk such as /dev/shm/lsdiskcache if enough extra memory can be spared to speed up further)
3. Manually create the directory from shell, and give write permission for litespeed/lshttpd processes (assume running as "nobody" here):
   
   Code:

   ---

   # mkdir /tmp/diskcache
       
# chown nobody:nobody /tmp/diskcache
             
# chmod 700 /tmp/diskcache

   ---

LSWS Web Admin Console->Virtual Hosts->mytest->Cache -> Cache Policy

Quote:

Enable Cache:No Cache Request with Query String:Yes Cache Request with Cookie:No Cache Response with Cookie:No Ignore Request Cache-Control:No Ignore Response Cache-Control:No Enable Private Cache: Yes* Private Cache Expire Time (seconds): 120

Note:

1. Even though Cache is disabled globally at Server Level, it will be enabled through rewrite rules. That's the way supposed to be.
2. Cache Request with Cookie can be set to Yes as long as cookie does NOT affect the generated page. Use it carefully.
3. *Set "Enable Private Cache" to Yes to turn on private cache. Private Cache is pertinent to each individual user/browser. This is to speed up performance even for logged-in user or cache for individual instead of public.

Cache can be turned on/off with "CacheEnable" , "CacheDisable" directives in Apache config file. Nothing needs to be done for the cache policy. It will assume the same default settings at LSWS Server level. Rewrite rules can be placed in httpd.conf or in-directory .htaccess file as shown in step 5 below.
Note: Apache mod_cache directives CacheIgnoreCacheControl, CacheMaxExpire also can be used in the Apache config file as well as .htaccess to fine tune cache policy.

Setup Cache Policy (LSWS Web Admin Console->Virtual Hosts->mytest->Cache -> Cache Policy)

Quote:

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

Note: those with not set, settings at LSWS Server Level will be assumed.

Code:

---

RewriteEngine On
## cache should be available for HEAD or GET requests

RewriteCond %{REQUEST_METHOD} ^HEAD|GET$
## select which pages to cache
RewriteCond %{HTTP_COOKIE} page_contain_cachetoken=yes
# with other condition

RewriteCond %{QUERY_STRING} !s=[a-fA-F0-9]{32}

# excluding certain URLs
RewriteCond %{REQUEST_URI} !/(login|register|usercp|private|profile|cron|image) \.php$

# cache for 2 mins for php pages only
RewriteRule /(.*\.php)?$ – [L,E=Cache-Control:max-age=120]

# for those not met above condition, enable private cache.
RewriteCond %{REQUEST_METHOD} ^HEAD|GET$
## select which pages to serve from private cache
RewriteCond %{HTTP_COOKIE} !page_contain_cachetoken=yes
# with other condition

RewriteCond %{QUERY_STRING} !s=[a-fA-F0-9]{32}

# excluding certain URLs
RewriteCond %{REQUEST_URI} !/(login|register|usercp|private|profile|cron|image) \.php$

# private cache for however long set in cache policy for php pages only
RewriteRule /(.*\.php)?$ – [L,E=Cache-Control:private]

---

These rules can be placed in either of the 3 locations below:

1. .htaccess (last line needs to changed as follows.)
   
   Code:

   ---

   RewriteRule (.*\.php)?$ – [L,E=Cache-Control:max-age=120]
RewriteRule (.*\.php)?$ – [L,E=Cache-Control:private]

   ---

2. VirutalHost secion in Apache config file
   
3. LiteSpeed native configuration: Web Admin Console -> Configurations -> Virtual Hosts -> Rewrite

Admin Console -> Actions -> Graceful Restart or issue '/path/to/lsws/bin/lswsctrl restart' from command line.

Since 4.0.19 release, LiteSpeed outputs a response header “X-LiteSpeed-Cache: hit” if a request is served from cache.

Since 4.1.1 release, LiteSpeed outputs a response header “X-LiteSpeed-Cache: hit,private” if a request is served from private cache.

Setup a cronjob to purge outdated cache file on disk and add the following entry in /etc/crontab

Code:

---

*/10 * * * * root find /tmp/diskcache -type f -mmin +8 -delete 2>/dev/null

---

Note: The cronjob deletes cached files that are more than 8 minutes old every 10 minutes. Since the cache TTL is set at 120 seconds (2 minutes), it's safe to delete those old files that are way passed TTL.