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| 说明 | 基于URI键的内容动态缓冲(内存或磁盘) |
|---|---|
| 状态 | 扩展(E) |
| 模块名 | cache_module |
| 源文件 | mod_cache.c |
Allow和
Denydirectives. You should not enable caching for any content to which you wish to limit access by client host name, address or environment variable.
mod_cacheimplements an RFC 2616 compliant HTTP content cache that can be used to cache either local or proxied content.mod_cacherequires the services of one or more storage management modules. Two storage management modules are included in the base Apache distribution:
mod_disk_cache
mod_mem_cache
mod_mem_cachecan be configured to operate in two modes: caching open file descriptors or caching objects in heap storage.
mod_mem_cachecan be used to cache locally generated content or to cache backend server content for
mod_proxywhen configured using
ProxyPass(aka
reverse proxy)
Content is stored in and retrieved from the cache using URI based keys. Content with access protection is not cached.
| 相关模块 | 相关指令 |
|---|---|
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#
# Sample Cache Configuration
#
LoadModule cache_module modules/mod_cache.so
#LoadModule disk_cache_module modules/mod_disk_cache.so
# If you want to use mod_disk_cache instead of mod_mem_cache,
# uncomment the line above and comment out the LoadModule line below.
CacheRoot c:/cacheroot
CacheEnable disk /
CacheDirLevels 5
CacheDirLength 3
LoadModule mem_cache_module modules/mod_mem_cache.so
CacheEnable mem /
MCacheSize 4096
MCacheMaxObjectCount 100
MCacheMinObjectSize 1
MCacheMaxObjectSize 2048
# When acting as a proxy, don't cache the list of security updates
CacheDisable http://security.update.server/update-list/
| 说明 | The default duration to cache a document when no expiry date is specified. |
|---|---|
| 语法 | CacheDefaultExpireseconds |
| 默认值 | CacheDefaultExpire 3600 (one hour) |
| 作用域 | server config, virtual host |
| 状态 | 扩展(E) |
| 模块 | mod_cache |
CacheDefaultExpiredirective specifies a default time, in seconds, to cache a document if neither an expiry date nor last-modified date are provided with the document. The value specified with theCacheMaxExpiredirective doesnotoverride this setting.
CacheDefaultExpire 86400
| 说明 | Disable caching of specified URLs |
|---|---|
| 语法 | CacheDisableurl-string |
| 作用域 | server config, virtual host |
| 状态 | 扩展(E) |
| 模块 | mod_cache |
CacheDisabledirective instructsmod_cachetonotcache urls at or belowurl-string.
CacheDisable /local_files
| 说明 | Enable caching of specified URLs using a specified storage manager |
|---|---|
| 语法 | CacheEnablecache_typeurl-string |
| 作用域 | server config, virtual host |
| 状态 | 扩展(E) |
| 模块 | mod_cache |
CacheEnabledirective instructsmod_cacheto cache urls at or belowurl-string. The cache storage manager is specified with thecache_typeargument.cache_typememinstructsmod_cacheto use the memory based storage manager implemented bymod_mem_cache.cache_typediskinstructsmod_cacheto use the disk based storage manager implemented bymod_disk_cache.cache_typefdinstructsmod_cacheto use the file descriptor cache implemented bymod_mem_cache.
In the event that the URL space overlaps between differentCacheEnabledirectives (as in the example below), each possible storage manager will be run until the first one that actually processes the request. The order in which the storage managers are run is determined by the order of theCacheEnabledirectives in the configuration file.
CacheEnable mem /manual
CacheEnable fd /images
CacheEnable disk /
When acting as a forward proxy server,url-stringcan also be used to specify remote sites and proxy protocols which caching should be enabled for.
# Cache proxied url's
CacheEnable disk /
# Cache FTP-proxied url's
CacheEnable disk ftp://
# Cache content from www.apache.org
CacheEnable disk http://www.apache.org/
| 说明 | Ignore request to not serve cached content to client |
|---|---|
| 语法 | CacheIgnoreCacheControl On|Off |
| 默认值 | CacheIgnoreCacheControl Off |
| 作用域 | server config, virtual host |
| 状态 | 扩展(E) |
| 模块 | mod_cache |
Ordinarily, requests containing a Cache-Control: no-cache or Pragma: no-cache header value will not be served from the cache. TheCacheIgnoreCacheControldirective allows this behavior to be overridden.CacheIgnoreCacheControlOn tells the server to attempt to serve the resource from the cache even if the request contains no-cache header values. Resources requiring authorization willneverbe cached.
CacheIgnoreCacheControl On
CacheStorePrivateCacheStoreNoStore| 说明 | Do not store the given HTTP header(s) in the cache. |
|---|---|
| 语法 | CacheIgnoreHeadersheader-string[header-string] ... |
| 默认值 | CacheIgnoreHeaders None |
| 作用域 | server config, virtual host |
| 状态 | 扩展(E) |
| 模块 | mod_cache |
According to RFC 2616, hop-by-hop HTTP headers are not stored in the cache. The following HTTP headers are hop-by-hop headers and thus do not get stored in the cache inanycase regardless of the setting ofCacheIgnoreHeaders:
ConnectionKeep-AliveProxy-AuthenticateProxy-AuthorizationTETrailersTransfer-EncodingUpgradeCacheIgnoreHeadersspecifies additional HTTP headers that should not to be stored in the cache. For example, it makes sense in some cases to prevent cookies from being stored in the cache.
CacheIgnoreHeaderstakes a space separated list of HTTP headers that should not be stored in the cache. If only hop-by-hop headers not should be stored in the cache (the RFC 2616 compliant behaviour),CacheIgnoreHeaderscan be set toNone.
CacheIgnoreHeaders Set-Cookie
CacheIgnoreHeaders None
Expireswhich are needed for proper cache management are not stored due to a
CacheIgnoreHeaderssetting, the behaviour of mod_cache is undefined.
| 说明 | Ignore the fact that a response has no Last Modified header. |
|---|---|
| 语法 | CacheIgnoreNoLastMod On|Off |
| 默认值 | CacheIgnoreNoLastMod Off |
| 作用域 | server config, virtual host |
| 状态 | 扩展(E) |
| 模块 | mod_cache |
Ordinarily, documents without a last-modified date are not cached. Under some circumstances the last-modified date is removed (duringmod_includeprocessing for example) or not provided at all. TheCacheIgnoreNoLastModdirective provides a way to specify that documents without last-modified dates should be considered for caching, even without a last-modified date. If neither a last-modified date nor an expiry date are provided with the document then the value specified by theCacheDefaultExpiredirective will be used to generate an expiration date.
CacheIgnoreNoLastMod On
| 说明 | The factor used to compute an expiry date based on the LastModified date. |
|---|---|
| 语法 | CacheLastModifiedFactorfloat |
| 默认值 | CacheLastModifiedFactor 0.1 |
| 作用域 | server config, virtual host |
| 状态 | 扩展(E) |
| 模块 | mod_cache |
In the event that a document does not provide an expiry date but does provide a last-modified date, an expiry date can be calculated based on the time since the document was last modified. TheCacheLastModifiedFactordirective specifies afactorto be used in the generation of this expiry date according to the following formula:expiry-period = time-since-last-modified-date *factorexpiry-date = current-date + expiry-periodFor example, if the document was last modified 10 hours ago, andfactoris 0.1 then the expiry-period will be set to 10*0.1 = 1 hour. If the current time was 3:00pm then the computed expiry-date would be 3:00pm + 1hour = 4:00pm. If the expiry-period would be longer than that set byCacheMaxExpire, then the latter takes precedence.
CacheLastModifiedFactor 0.5
| 说明 | The maximum time in seconds to cache a document |
|---|---|
| 语法 | CacheMaxExpireseconds |
| 默认值 | CacheMaxExpire 86400 (one day) |
| 作用域 | server config, virtual host |
| 状态 | 扩展(E) |
| 模块 | mod_cache |
CacheMaxExpiredirective specifies the maximum number of seconds for which cachable HTTP documents will be retained without checking the origin server. Thus, documents will be out of date at most this number of seconds. This maximum value is enforced even if an expiry date was supplied with the document.
CacheMaxExpire 604800
| 说明 | Attempt to cache requests or responses that have been marked as no-store. |
|---|---|
| 语法 | CacheStoreNoStore On|Off |
| 默认值 | CacheStoreNoStore Off |
| 作用域 | server config, virtual host |
| 状态 | 扩展(E) |
| 模块 | mod_cache |
Ordinarily, requests or responses with Cache-Control: no-store header values will not be stored in the cache. TheCacheStoreNoCachedirective allows this behavior to be overridden.CacheStoreNoCacheOn tells the server to attempt to cache the resource even if it contains no-store header values. Resources requiring authorization willneverbe cached.
CacheStoreNoStore On
CacheIgnoreCacheControlCacheStorePrivate| 说明 | Attempt to cache responses that the server has marked as private |
|---|---|
| 语法 | CacheStorePrivate On|Off |
| 默认值 | CacheStorePrivate Off |
| 作用域 | server config, virtual host |
| 状态 | 扩展(E) |
| 模块 | mod_cache |
Ordinarily, responses with Cache-Control: private header values will not be stored in the cache. TheCacheStorePrivatedirective allows this behavior to be overridden.CacheStorePrivateOn tells the server to attempt to cache the resource even if it contains private header values. Resources requiring authorization willneverbe cached.
CacheStorePrivate On
CacheIgnoreCacheControlCacheStoreNoStore