http {
    ...
    server {
        ...
        location = /favicon.ico {
            rewrite ^ /index.php;
            log_not_found off;
        }

        location = /robots.txt {
            rewrite ^ /index.php;
            log_not_found off;
        }

        location / {
            try_files $uri $uri/ /index.php?$args;
        }
        ...
    }
}