httpd代理服务器和缓存的讲解

Apache从1.2版本开始，代理模块就已经加入到Apache源代码中，可惜当时的代理模块有很多问题，例如，与较新的http规范不兼容，没有人来维护它，甚至还不能从服务器中删除它等。从Apache2.0版本起，mod_proxy模块不但被重写了，而且还分割成了4个不同的模块mod_proxy、mod_proxy_http、mod_proxy_ftp、mod_proxy_connect,并且能够使用http规范较新的特征，这意味着速度更快，而到了Apache2.2版本以后更进一步加入了mod_proxy_ajp、mod_proxy_balancer这两个模块

--httpd2.2版本支持的代理模块

[root@saltstack01 modules]# httpd -D DUMP_MODULES|grep proxy

proxy_module (shared)

proxy_balancer_module (shared)

proxy_ftp_module (shared)

proxy_http_module (shared)

proxy_ajp_module (shared)

proxy_connect_module (shared)

Syntax OK

[root@saltstack01 modules]#

--httpd2.4版本支持的代理模块

[root@localhost modules]# httpd -D DUMP_MODULES|grep proxy

AH00558: httpd: Could not reliably determine the server's fully qualified domain name, using localhost.localdomain. Set the 'ServerName' directive globally to suppress this message

proxy_module (shared)

proxy_ajp_module (shared)

proxy_balancer_module (shared)

proxy_connect_module (shared)

proxy_express_module (shared)

proxy_fcgi_module (shared)

proxy_fdpass_module (shared)

proxy_ftp_module (shared)

proxy_http_module (shared) proxy_scgi_module (shared)