How should I use the <If> directive in .htaccess?
Solution 1:
The <If>
directive is only available in Apache 2.4+ and not 2.2 or earlier.
http://httpd.apache.org/docs/2.4/mod/core.html#if
Documentation not present in 2.2:
http://httpd.apache.org/docs/2.2/mod/core.html#if
Solution 2:
<If>
is only available in Apache 2.4+, so firstly make sure that you have that version.
Examples
# Compare the host name to example.com and redirect to www.example.com if it matches
<If "%{HTTP_HOST} == 'example.com'">
Redirect permanent "/" "http://www.example.com/"
</If>
<If "%{HTTP_HOST} =~ /regex/">
SecFilterEngine Off
SecFilterScanPOST Off
</If>
<If "%{REQUEST_URI} =~ m#/regex/including/slashes/#">
SecFilterEngine Off
SecFilterScanPOST Off
</If>
Alternatives to <If>
There are a few other solutions for doing conditional statements in Apache 2.2 if you're still stuck with that.
You can set environment variables via:
- Apache configuration
SetEnvIf
- mod_rewrite's
RewriteMatch
Then you can perform conditional statements using
<IfDefine MyEnvironmentVar> ... </IfDefine>
Example:
# Set environment variable if we're on staging site
SetEnvIf Host staging ROBOTS_NOINDEX
# Set environment variable if we're within a specific folder
SetEnvIf Request_URI ^/app/webroot/files/ ROBOTS_NOINDEX
# Send custom header if environment variable is set
Header set X-Robots-Tag "noindex" ENV=ROBOTS_NOINDEX