I can access my site using /index.php?q=node/1 or /?q=node/1

When I add the code below, /?q=node/1 stop working:

location / {
index index.php index.htm index.html;
try_files $uri /_cache$uri /index.php;
}

why?

Marcos Neves
+55 44 9918-8488
_______________________________________________
nginx mailing list
nginx@nginx.org
http://nginx.org/mailman/listinfo/nginx