autoindexexactsize

autoindexexactsize is a directive commonly found in web server configuration files, particularly Apache HTTP Server. Its primary function is to control how the server generates directory listings when a client requests a directory that does not contain an index file (such as index.html or index.php). Specifically, autoindexexactsize, when enabled, instructs the server to display the exact size of files in the generated directory listing.

When autoindexexactsize is set to a value that enables this feature (often "On" or a similar positive boolean), each file listed in the directory will show its size in bytes. This provides users with precise information about the file sizes, which can be useful for understanding storage requirements or download estimates. If autoindexexactsize is disabled or not set, the server typically displays file sizes in a more human-readable format, such as kilobytes (KB), megabytes (MB), or gigabytes (GB), or may omit file sizes altogether depending on other related directives.

The exact behavior and availability of autoindexexactsize can depend on the specific version of the web server software being used and its configuration. It is often used in conjunction with other directives that govern directory indexing, such as Indexes and FancyIndexing, to customize the appearance and content of these automatically generated pages. Administrators can leverage autoindexexactsize to fine-tune the information presented to users browsing directory contents.