The proxy server is an application installed on the firewall. It connects the LAN inside the firewall to the Intemet. The proxy server provides the following functions. ● Monitors data packets sent through the firewall and records transmission information. ● Filter packet addresses through the firewall. ● Provides the File Cache function. The proxy server can
The proxy server is an application installed on the firewall. It connects the LAN inside the firewall to the Intemet. The proxy server provides the following functions. ● Monitors data packets sent through the firewall and records transmission information. ● Filter packet addresses through the firewall. ● Provides the File Cache function. The proxy server can
ProxyA server (proxyserver) is an application installed on the firewall. It connects the LAN inside the firewall to Intemet.
ProxyThe functions of the server are as follows.
● Monitors data packets sent through the firewall and records transmission information.
● Filter packet addresses through the firewall.
● Provides the File Cache function.
ProxyThe server can
ProxyService type, such as HTtP
ProxyAnd FFP
Proxy. We use HTTP
ProxyFor example
ProxyServer features. When the client in the LAN uses HTIT
ProxyServer, its HTTP request will be sent
ProxyServer instead of directly sending it to the source address. If
ProxyServer
ConfigurationThe File Cache function is enabled. When receiving a customer request, the system first checks whether the user needs content in the cache. If the cache does not exist, you need to retrieve it from the HTTP source address and then return the corresponding content to the user. Later, if the user requests the same content,
ProxyThe server extracts data directly from the cache.
ConfigurationApacheHTTP
Proxy
As the WWW server software, Apache provides HTFP
ProxyFunction. Next we will introduce Apache
ProxyOf
ConfigurationMethod:
(1) modify the/etc/httpd/conf/httpd. conf file and add
ProxyCache-related functions. And
ProxyThe cache-related keywords are as follows.
In the httpa. conf file
ProxyCache-related keywords
ProxyRequests On/Off enable or disable Apache
ProxyFunction
Proxyremote path URL remote server defines this
ProxyRemote Server
Proxy. When the user request matches the URL, the remote server is used as the remote
ProxyServer.
The remote server is in the format of protocol: // hostname [: port], because Apache can only
ProxyHTTP service, so the protocol value is always HTTP
ProxyPass path URL allows you to mirror a remote server to a local server. At this time, the local
ProxyThe server seems to be remote.
ProxyAn image of the server
ProxyBlock word/hostname/domain
ProxyServer filter. After the ProxyBlock keyword, a group of words, node names, and domain names are defined. If your HTYP request contains the words, node names, or domain names, the request will be filtered out.
CacheRoot directory
ProxyCached root directory
CacheSize size
ProxyCache size, in KB
CacheGcInterval time checks the cache every hour. If the cache space exceeds the upper limit set by CacheSize, the files in the cache can be deleted for a maximum of hours. The expiration time of files is defined here.
CacheLastModifiedFactor if no file expiration time is defined, the expiration time is calculated according to the following formula: expiration time = interval of the last modification * factor
CacheDirLevels levels cache sub-directory Layers
Cachedirlen……
ProxyNumber of letters in the cached subdirectory name
CacheDefauhExpire time if the file is obtained through a protocol that does not support the expiration time, the time is used as the expiration time
NoCache word/hostname/domain defines a group of words, node names, and domain names after the NoCache keyword. HTFP files containing these words, node names, or domain names will not be cached
(2) modify the file/etc/httpd/conL/access. conf and add
ProxyDirectory Access Control. The following is an instance.
Order deny, allow
Deny from all
Allow from.company.com
(3) Confirm that the cache directory specified by the CacheRoot keyword already exists.
Restart hnpd and the cache function will take effect.
