Nginx HTTP Server - Fourth Edition

Map

Just like the Browser module, the Map module allows you to create maps of values, depending on a variable:

map $uri $variable { 
  /page.html  0; 
  /contact.html  1; 
  /index.html  2; 
  default 0; 
} 
rewrite ^ /index.php?page=$variable; 

The map directive can only be inserted within the http block. Following this example, $variable may have three different values. If $uri was set to /page.html, $variable, the value is now defined as 0; if $uri was set to /contact.html, $variable is now 1; if $uri was set to /index.html, $variable, the value now equals 2. For all other cases (default), $variable is set to 0. The last instruction rewrites the URL accordingly. Apart from default, the map directive accepts another special keyword: hostnames. It allows ...