Nginx lower-/uppercase

This module simply uppercases or lowercases a string and saves it into a new variable.

It knows only two directives: upper and lower

Example

    set $var1 "hello";
    set $var2 "WORLD";

    upper $var3 "$var1 $var2"; # $var3 will be "HELLO WORLD"
    lower $var4 "$var1 $var2"; # $var4 will be "hello world"