The following options enable various standard features of the mod_perl API. While not absolutely needed, they're very handy and there's little penalty in including them. Unless specified otherwise, these options are all disabled by default. The EVERYTHING=1 or DYNAMIC=1 options will enable them en masse. If in doubt, include these.
Enables the Apache::File class, which helps with the handling of files under mod_perl.
Enables the Apache::Table class, which provides tied access to the Apache Table structure (used for HTTP headers, among others).
Enables the Apache::Log class. This class allows you to access Apache's more advanced logging features.
Enables the Apache::URI class, which deals with the parsing of URIs in a similar way to the Perl URI::URL module, but much faster.
Enables the Apache::Util class, allowing you to use various functions such as HTML escaping or date parsing, but implemented in C.
Enables the Apache::Connection class. This class is enabled by default. Set the option to 0 to disable it.
Enables the Apache::Server class. This class is enabled by default. Set the option to 0 to disable it.
Please refer to Lincoln Stein and Doug MacEachern's Writing Apache Modules with Perl and C (O'Reilly) for more information about the Apache API.