Module does not work in some nginx configurations

This module currently relies on behavior provided by core's .htaccess file to make the autocomplete work. Unless nginx is configured in a completely identical way, the module's autocomplete callback will return a Drupal 404.

On Apache, this results in the callback PHP being executed.
/sites/all/modules/google_appliance_suggest/google_appliance_suggest_callback.php/query

On some configurations of nginx (e.g. that on Pantheon), the callback PHP file is never executed.

The solution is to use something like the following:

/sites/all/modules/google_appliance_suggest/google_appliance_suggest_callback.php?q=/query