Apache Reference: mod_speling, CheckSpelling

CheckSpelling

Spelling Module Operation Switch
Syntax: CheckSpelling on|off
Example: CheckSpelling on
Since: Apache 1.3

This directive toggles the operation of mod_speling. When its operation is turned on, incorrectly capitalized and misspelled URLs in requests are fixed as if by magic. Keep in mind that the directory scan that is necessary for the spelling correction will affect the server's performance when many spelling corrections must be performed at the same time.