apache配置文件中的自定义错误（不是错误页面）

Question

I'm not looking to create custom error pages, but to actually issue error messages when the config file is parsed. Specifically, I want to use an <IfModule> to throw up an error if the module hasn't been loaded, so it's easier to debug.

Answer 1

For Httpd 2.4 see http://httpd.apache.org/docs/2.4/en/mod/core.html#error

For older versions

<IfModule !mod_deflate.c>
     Mod_deflate_not_enabled.
</IfModule>

will raise something like

Syntax error on line 7 of /etc/apache2/sites-enabled/000-default:
Invalid command 'Mod_deflate_not_enabled.', perhaps misspelled ...
   ...fail!

when you reload the server config.

Answer 2

This is the only kludgy thing I could think of (and requires mod_rewrite enabled):

<IfModule !mod_deflate.c>
        ErrorDocument 500 "mod_deflate isn't available"
        RewriteEngine On
        RewriteRule .* - [R=500]
</IfModule>

If you find a better way to 'trigger' errors, I'm certainly interested ;)