一直搞不太清楚apache在配置虚拟主机时的一些选项，今天特意去翻看了apache的官方Document，终于可以很详尽地查看官方的解释了：

主要看下Options的一些配置选项，如下：

The Options directive controls which server features are available in a particular directory.

option can be set to None, in which case none of the extra features are enabled, or one or more of the following:

All
All options except for MultiViews. This is the default setting.
ExecCGI
Execution of CGI scripts using mod_cgi is permitted.
FollowSymLinks
The server will follow symbolic links in this directory.

Even though the server follows the symlink it does not change the pathname used to match against <Directory> sections.

The FollowSymLinks and SymLinksIfOwnerMatchOptions work only in <Directory> sections or .htaccess files.

Omitting this option should not be considered a security restriction, since symlink testing is subject to race conditions that make it circumventable.

Includes
Server-side includes provided by mod_include are permitted.
IncludesNOEXEC
Server-side includes are permitted, but the #exec cmd and #exec cgi are disabled. It is still possible to #include virtual CGI scripts from ScriptAliased directories.
Indexes
If a URL which maps to a directory is requested, and there is no DirectoryIndex (e.g., index.html) in that directory, then mod_autoindex will return a formatted listing of the directory.
MultiViews
Content negotiated "MultiViews" are allowed using mod_negotiation.
SymLinksIfOwnerMatch
The server will only follow symbolic links for which the target file or directory is owned by the same user id as the link.

有很多选项，其中我想用的最多就是FollowSymlinks、Indexes和Includes了，下面我们来一个一个看：

1.All    这个配置选项是默认配置，意思是除了MultiViews选项其他所有选项都有。

2.ExecCGI    表明使用mod_cgi执行CGI脚本被允许

3.FollowSymlinks    填写该选项后，服务器会跟踪指定目录的符号连接，下面的说明表示该选项不会改变被使用在<Directory>中的路径，而且这个选项和SymlinksIfOwnerMatch选项只在<Directory>和.htaccess中有效。

4.Includes    被mod_include提供的服务器端的引入被允许,至于服务器端的引入详见http://httpd.apache.org/docs/current/howto/ssi.html，主要就是提供一种向已存在的HTML文档中添加动态内容的方式。

5.IncludesNOEXEC    服务器端引入被允许，但是#exec cmd和#exec cgi被禁用。

6.Indexes    如果映射到一个目录的url被请求，并且在那个目录中没有所指定的DirectoryIndex，那么mod_autoindex就会返回一个格式化的目录列表。

7.MultiViews    MultiViews被允许使用mod_negotiation.

8.SymLinksIfOwnerMatch    服务器只跟随那些被同一个用户id拥有的目标文件或者目录作为连接。


谢谢。