nginx_app.conf

location / {
  # try to serve file directly, fallback to rewrite
  try_files $uri @rewriteapp;
}
location @rewriteapp {
  # rewrite all to index.php
  rewrite ^(.*)$ /index.php?p=$1 last;
}
location ~ ^/(index)\.php(/|$) {
  client_max_body_size 20M;
  fastcgi_pass heroku-fcgi;
  fastcgi_split_path_info ^(.+\.php)(/.*)$;
  include fastcgi_params;
  fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
  fastcgi_param HTTPS on;
}