Detect Apache version in apache config?

Question

tl;dr: How do I do the following in a .conf or .htaccess file:

  # Do A


  # Do B
&         


        

Answer 1

You can run different versions of Apache on the same host. Q: What's wrong with separate config files in separate directories? I honestly believe that's probably the cleanest approach...

Nevertheless, Apache .conf files allow an <IfDefine>, which you can specify at runtime with "-D":

http://httpd.apache.org/docs/2.0/mod/core.html#ifdefine

Answer 2

Assuming you have mod_version installed (many distributions ship it by default) you can do the following:

<IfVersion >= 2.4>
    # Require ...
</IfVersion>
<IfVersion < 2.4>
    # Order ...
    # Deny ...
    # Allow ...
</IfVersion>

Answer 3

I ran into this problem because FallbackResource is not in early versions of Apache and often clever hosting companies remove mod_rewrite once they have a version of Apache with FallbackResource. I use the following .htaccess when I want to put library code up that adapts to its environment:

<IfModule mod_rewrite.c>
    RewriteEngine on
    RewriteRule ^ - [E=protossl]
    RewriteCond %{HTTPS} on
    RewriteRule ^ - [E=protossl:s]
    RewriteRule "(^|/)\." - [F]
    RewriteCond %{REQUEST_FILENAME} !-f
    RewriteCond %{REQUEST_FILENAME} !-d
    RewriteCond %{REQUEST_URI} !=/favicon.ico
    RewriteRule ^ index.php [L]
</IfModule>

<IfModule !mod_rewrite.c>
    FallbackResource index.php
</IfModule>

Now of course there are some Apache versions / setups where this fails - but if mod_rewrite is there, use it and if not, hope that FallbackResource is there.

Answer 4

You could bypass the need to know by using mod_rewrite for your access control:

RewriteEngine On
RewriteCond %{REQUEST_URI} !\.(long|list|file|types)$
RewriteRule .* - [F,L]

Answer 5

A hack that I have used.

# Apache 2.2
<IfModule !mod_authz_core.c>
    Satisfy Any
</IfModule>

# Apache 2.4
<IfModule mod_authz_core.c>
    Require all granted
</IfModule>