Почему не работает конфиг?

location ~ \api\.php$  { 
        try_files $uri /index.php =404;
        fastcgi_pass unix:/var/run/php5-fpm.sock;
        fastcgi_index index.php;
        fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
        include fastcgi_params;
              rewrite ^(.*)$ /api/index.php break; 
        }