## LiteSpeed Web Server
Users' Manual

### Version 6.3 — Rev. 4

- License Enterprise
- Introduction
- Installation
- Administration
- Security
- Configuration
  - Server General
  - Server Log
  - Server Tuning
  - Server Security
  - Page Cache
  - PageSpeed Config
  - External Apps
  - Fast CGI App
  - Fast CGI Authorizer
  - LSAPI App
  - Servlet Engine
  - Web Server
  - Piped logger
  - Load Balancer
  - Script Handler
  - PHP
  - App Server Settings
  - Listener General
  - Listener SSL
  - Virtual Host Templates
  - Virtual Host Basic
  - Virtual Host General
  - Virtual Host Security
  - Virtual Host SSL
  - Virtual Host PageSpeed Config
  - Rewrite
  - Context
  - Static Context
  - Java Web App Context
  - Servlet Context
  - Fast CGI Context
  - LSAPI Context
  - Proxy Context
  - CGI Context
  - Load Balancer Context
  - Redirect Context
  - App Server Context
  - Rack/Rails Context
  - Add-ons
- Web Console
  - Admin Console General
  - Admin Console Security
  - Admin Listener General
  - Admin Listener SSL

# Page Cache Settings

## Table of Contents

### Cache Features⇑

#### Description

Specifies a selection of cache features to individually enable.
On: Enable the cache engine.
Crawler: Enable crawler feature.
ESI: Enable ESI feature.
Features enabled globally at the Server level can be overridden at the Virtual Host level.
Note: Setting Enable LiteMage to On at the Virtual Host level will override this setting and automatically enable the cache engine and all features.
Default value: Everything enabled

#### Syntax

Select from checkbox

### Storage Path⇑

#### Description

Specifies the directory for holding cached objects. Currently, LiteSpeed Cache stores each object in its own file. The filename is a hash of the object key. Multiple levels of directories will be created in order to avoid holding too many files in one directory. This value must be set at the Server level in order to enable cache. Virtual Host level settings will override Server level settings.

#### Syntax

path

#### Tips

Assign a dedicated disk or disk array as the cache storage. RAID0 is recommended.
It is recommended to set a different cache storage path for each Virtual Host to prevent purge all requests from affecting other Virtual Hosts.

### Enable LiteMage⇑

#### Description

Enables LiteMage Cache for Magento Stores.
When set to 'On' the server will also try to use shared private cache information to speed up page load time for first time visitors. Select 'Safe' to disable this feature.

#### Syntax

Select from drop down list

#### Tips

This setting will not work if your LiteSpeed license does not have the LiteMage module enabled.

### Cache Manager Path⇑

#### Description

Specifies the directory used to store cache manager files. These files are stored in Storage Path by default.

#### Syntax

path

#### Tips

A separate location on a fast disk is recommended to prevent the accidental removal of cache manager files. Only set to a location on a RAM disk if cache storage is also saved on a RAM disk.

### Public Storage Expire (minutes)⇑

#### Description

The maximum age of a cached file before the server will attempt to physically remove it. This removal operation will occur once per day to prevent cache storage from growing too large. Minimum setting is 60 minutes.

#### Syntax

Integer number

#### Tips

Set this value to a time greater than your longest TTL to help prevent the removal of still valid cache files.

### No Hit Expire (minutes)⇑

#### Description

The maximum number of minutes a cached file will remain in cache storage without a cache hit before being physically removed by the server. Set to 0 to disable this feature.
Default value: 0

#### Syntax

Integer number

### Check Public Cache⇑

#### Description

Specifies whether to check against the public cache for URLs requested in the current context. Can be set at the server level, virtual host level, or context level.

#### Syntax

Select from radio box

### Check Private Cache⇑

#### Description

Specifies whether to check against the private cache for URLs requested in the current context. Can be set at the server, virtual host, or context level.

#### Syntax

Select from radio box

### Respect Cacheable⇑

#### Description

Respect the value of regular "Cache-Control" response headers when LiteSpeed-specific cache control has not been provided.
LiteSpeed-specific cache control includes the X-litespeed-cache-control response header and the cache-control environment variable set via rewrite rule.

#### Syntax

Select from radio box

#### Tips

This setting is enabled by default.

### Max Object Size⇑

#### Description

Specifies the maximum size of an object, up to 100M, that can be stored in the cache directory.
Default value: 10M

#### Syntax

Integer number

### Cache Stale Age (seconds)⇑

#### Description

Specifies how long an object will continue to be served from cache after it has expired but before a new cached copy is available. The default is "10" seconds.

#### Syntax

Integer number

### Cache Key Modifications⇑

#### Description

Makes some requests more cache-friendly by allowing junk query string parameters to be dropped from URLs.

#### Syntax

clear discards all previous configurations, -qs:[string] drop all query strings where the name matches [string] exactly, or -qs:utm* drop all query strings where the name part starts with [string]. Input one rule per line.

#### Example

-qs:utm* drops all query strings where the name part starts with "utm".
-qs:gclid drops all query strings where the name matches "gclid" exactly.

### Cache Expire Time (seconds)⇑

#### Description

Specifies how long an object will be cached. The default is "86400" seconds (one day).

#### Syntax

Integer number

### Private Cache Expire Time (seconds)⇑

#### Description

Specifies how long an object will be cached in private cache. The default is "60" seconds.

#### Syntax

Integer number

### Micro Cache 5XX Response⇑

#### Description

Cache pages responding with HTTP status code 5xx (500, 503, etc) for 10 seconds when the cache response header indicates that the page is cacheable.
Default values:
Server level: Yes
VH level: Inherit Server level setting
Context-level Inherit VH level setting

#### Syntax

Select from radio box

#### Tips

Enabling this setting is useful for avoiding bad requests but can also act as some added DDoS protection.

### Enable POST cache⇑

#### Description

Specifies if POST requests can be cached using the "x-litespeed-cache-control" header.
Default value: No

#### Syntax

Select from radio box

### Do-Not-Cache URL⇑

#### Description

A list of URL segments where any URL containing these listed segments will not be cached. String matching is used. Regular expressions are not supported. Can be set at the server or virtual host level. URL segments listed at the server level are inherited by all virtual hosts and added to their Do-Not-Cache URL lists.

#### Tips

You can add comments by starting a line with "#".

### No Cache Domain⇑

#### Description

A comma-separated list of domains that will not be cached.

#### Syntax

Comma-separated list. Domain names are case insensitive and the leading "www." should be removed. The wildcard characters "*" and "?" are allowed. "?" only replaces one character. "*" replaces any number of characters. For example, "*.mydomain.com" will match all subdomains of mydomain.com. Duplicate domain names are not allowed.