This is just a diary. Apache provides the powerful .htaccess file, actually it realises some of the functions of server configuration. The .htaccess file may write the regular expression, write the correlative commands, etc., these commands will be parsed by Apache, these commands' essential are that start the correlative background programs.

The functions of .htaccess file which provides by Apache, may realise the special functions, such as make every files invoke the Rewrite module, mod_expires module, every folder appoints the 404 error page, etc.. These are PHP, JSP, Perl and the other none of any language of program may realise directly, because the .htaccess file just realises the functions of server configuration. Whereas, if need the more complicated judgement, the .htaccess file will need to cooperate with the program. As the previous example, http://www.auciou.com/peace/83, use the .htaccess file to combine with PHP program, the .htaccess file appoints the 404 error page, it selects many 404 error page via the judgement of PHP program.

All of the programs which use the Apache as the server background, such as PHP, may use the .htaccess file. ASP+IIS, or PHP+IIS, can not realise the functions of .htaccess file, because IIS does not support the .htaccess file.

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