Modules | ... Apache HTTP Server Version 2.2 . ... the directory scan which is necessary for the spelling correction will have an impact on the server 's performance when many spelling corrections have to be performed at the same time. the document trees should not contain sensitive files which could be matched inadvertently by a spelling correction . the module is unable to correct misspelled user names (as in http ://my.host/~apahce/ ), just file names or directory names ...