Description:

The index of a directory can come from one of two sources:

* A file written by the user, typically called index.html. The DirectoryIndex
directive sets the name of this file. This is controlled by mod_dir.

* Otherwise, a listing generated by the server. The other directives control
the format of this listing. The AddIcon, AddIconByEncoding and AddIconByType
are used to set a list of icons to display for various file types; for each
file listed, the first icon listed that matches the file is displayed. These
are controlled by mod_autoindex.

The two functions are separated so that you can completely remove (or replace)
automatic index generation should you want to.

Automatic index generation is enabled with using Options +Indexes. See the
Options directive for more details.

If the FancyIndexing option is given with the IndexOptions directive,
the column headers are links that control the order of the display. If
you select a header link, the listing will be regenerated, sorted by the
values in that column. Selecting the same header repeatedly toggles between
ascending and descending order. These column header links are suppressed
with the IndexOptions directive's SuppressColumnSorting option.

Note that when the display is sorted by "Size", it's the actual size of
the files that's used, not the displayed value - so a 1010-byte file will
always be displayed before a 1011-byte file (if in ascending order) even
though they both are shown as "1K".