nginx microcaching drupal

josh.conf

fastcgi_cache_path /dev/shm/microcache levels=1:2 keys_zone=microcache:5M max_size=1G inactive=2h;
map $http_cookie $cache_uid {
  default nil; # hommage to Lisp :)
  ~SESS[[:alnum:]]+=(?<session_id>[[:alnum:]]+) $session_id;
}

map $request_method $no_cache {
  default 1;
  HEAD 0;
  GET 0;
}

client_max_body_size 10M;