| The mod_proxy module handles a multitude of proxying and caching capabilities for the server. Proxies enforce security by screening and relaying requests made by a client; caches help to optimize transfer by storing recently requested information.
CacheDefaultExpire time [ server config or within <VirtualHost>] This sets the default expiry time, in hours, of a document in the cache, assuming an expiry has not already been set. The default is one hour . After the document has been expired , the client must refetch it directly from the server.
CacheDirLength length [ server config or within <VirtualHost>] This directive sets the number of characters a directory can contain in the proxy cache. CacheDirLength 1024768
CacheDirLevels level [ server config or within <VirtualHost>] This directive sets the number of subdirectories in the cache. CacheDirLevels 10
CacheForceCompletion percentage [ server config or within <VirtualHost>] This directive specifies the minimum percentage of a document required in order for it to be cached. This is useful in the event a document is canceled before completing a transfer. The default is 90 percent.
CacheGcInterval time [ server config or within <VirtualHost>] This directive instructs the server to garbage-collect the cache if the space usage is greater than the size specified by the CacheSize directive. The collection is performed every time hours. You can specify a noninteger for the time if you want to perform garbage collections between hours.
CacheLastModifiedFactor factor [ server config or within <VirtualHost>] This directive estimates an expiry date for a document by multiplying the factor specified by the time since the last modification. This is effective only if an expiry date for a document has not been set already. If the expiration date is greater than CacheMaxExpire, CacheMaxExpire is used instead.
CacheMaxExpire time [ server config or within <VirtualHost>] This directive specifies the maximum amount of time a document should remain active. Once past this time, it is considered "expired" and should be reloaded directly from the server.
CacheRoot directory [ server config or within <VirtualHost>] This directive sets the name of the directory that will contain cache files.
CacheSize size [ server config or within <VirtualHost>] This directive sets the maximum size, in kilobytes, of the cache. Once this size is exceeded, no more data is written to the cache.
NoCache word host domain list [ server config or within <VirtualHost>] This directive specifies a matching of documents that are not cached by the server. You can use one of three options: - word
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The server searches for any such word in the title of the document. If one is found, the document is not cached. - host
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A document that originates from the target host isn't cached. - domain list
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Documents originating from any domain in the list are not cached. For example: NoCache abc.com def.com ghi.com NoCache somecompany NoCache * Note that you are allowed to use wildcards. The last example forces the server not to cache any documents at all.
NoProxy domainsubnetiphostname [ server config or within <VirtualHost>] Specifies a list of intranet addresses or domains the proxy should not attempt to intermediate between. The parameter can be one of the following: - domain
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A domain name, like .oreilly.com ; hosts from the domain can bypass the proxy - hostname
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A full hostname that can bypass the proxy - IP
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An IP address of a host that can bypass the proxy - subnet
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A subnet of addresses that can bypass the proxy For example, the following disables the proxy for all addresses in the subnet 192.168: NoProxy 192.168.0.0
ProxyBlock wordhostdomain list [ server config or within <VirtualHost>] Specifies a list of intranet addresses or domains which the proxy should block access to any documents on the server. The parameter can be one of the following: - word
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The server searches for any such word in the title of the document. If one is found, the document is blocked. - host
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A document that originates from the target host will be blocked. - domain list
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Documents originating from any domain in the list are blocked. For example, the following blocks all requests for documents from dirtyrotten.com and hackers.com: ProxyBlock dirtyrotten.com hackers.com
ProxyDomain domain [ server config or within <VirtualHost>] This directive specifies the default domain of the proxy. For example: ProxyDomain .oreilly.com
ProxyPass path url [ server config or within <VirtualHost>] This directive translates requests for a specific path to be redirected to the corresponding url . This allows remote servers to act as if they existed in the local filesystem. Note that this directive takes place regardless of whether the ProxyRequests directive is activated. For example: ProxyPass /mydir http://www.otherserver.com/mydir
ProxyPassReverse path url [ server config or within <VirtualHost>] Handles redirects made by a server pointed to by the ProxyPass directive by modifying the Location header in the HTTP redirect response. This directive alters redirect references to a specific path to the corresponding url .
ProxyReceiveBufferSize bytes [ server config or within <VirtualHost>] Specifies the networking buffer size for outgoing connections through the proxy. The value must be greater than 512. However, you can use the value 0 to indicate that the system's default buffer size should be used. For example: ProxyReceiveBufferSize 4096
ProxyRemote match remote-server [ server config or within <VirtualHost>] This directive specifies a remote proxy that should be used under user -definable conditions. The match parameter is either a URL scheme (http, ftp, etc.) that the server supports, or a partial URL which should be redirected to the remote proxy. The remote-server parameter should be organized as a fully qualified URL, as shown below: ProxyRemote ftp http://ftpproxy.oreilly.com:8080 ProxyRemote * http://handle.everything.oreilly.com:9001 Currently, http is the only scheme supported for the remote-server parameter.
ProxyRequests onoff [ server config or within <VirtualHost>] This directive activates or deactivates proxy serving. The default is: ProxyRequests Off Note that even though proxy requests are deactivated, the ProxyPass directives are still valid. | 
