httpd.conf variables : What is the difference between ${var} and %{var}?
- by 108.im
What is the difference between ${var} and %{var} in httpd.conf?
How and when would one use ${} and %{}?
http://httpd.apache.org/docs/2.4/configuring.html mentions :
The values of variables defined with the Define of or shell
environment variables can be used in configuration file lines using
the syntax ${VAR}.
http://httpd.apache.org/docs/2.4/mod/mod_rewrite.html mentions:
Server-Variables:These are variables of the form %{ NAME_OF_VARIABLE }
and
RewriteMap expansions:These are expansions of the form ${mapname:key|default}.
Will ${VAR} be used everywhere in httpd.conf, except in mod_rewrite directive's (like RewriteCond, RewriteRule but except for RewriteMap expansions which use ${} as in RewriteRule ^/ex/(.*) ${examplemap:$1} )
Would a variable set in httpd.conf using SetEnvIf Directive, for use in same httpd.conf, be used as ${var} except when the variable is used with mod_rewrite directive's, where the variable would be used as %{var}?
