Rails4 and Angularjs with Nginx + Proxy cache

site.conf

upstream puma {
  server 127.0.0.1:8080 fail_timeout=0;
}

proxy_cache_path  /home/of/all/evil/stuffs/as/shared/tmp/cache/nginx levels=1:2 keys_zone=api-cache:10m max_size=1000m inactive=200m;

# HTTP server
#
server {

  listen 0.0.0.0:80;
  server_name somedomain.com;
  root /home/of/all/evil/stuffs/as/current/public;

  access_log /home/of/all/evil/stuffs/as/current/log/access.log;
  error_log /home/of/all/evil/stuffs/as/current/log/error.log;

  location ^~ /assets/ {
    gzip_static on;
    expires max;
    add_header Cache-Control public;
  }

  location ^~ /ng-assets/ {
    gzip_static on;
    expires max;
    add_header Cache-Control public;
  }

  location ^~ /templates/ {
    expires -1;
    add_header Cache-Control no-cache;
  }

  location ^~ /api/v1/ {
    proxy_ignore_headers "Set-Cookie" "Cache-Control";
    proxy_cache api-cache;
    proxy_cache_valid any 6h;
    proxy_cache_use_stale error timeout invalid_header updating;
    add_header X-NC Yes;
    proxy_pass http://puma;
  }

  try_files $uri/index.html $uri @puma;

  location @puma {
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header Host $http_host;
    proxy_redirect off;
    proxy_pass http://puma;
    proxy_connect_timeout 300;
    proxy_read_timeout 300;
  }

  gzip              on;
  gzip_http_version 1.0;
  gzip_disable      "MSIE [1-6]\.(?!.*SV1)";
  gzip_buffers    4 16k;
  gzip_comp_level 2;
  gzip_min_length 0;
  gzip_types    text/plain text/css application/x-javascript text/xml application/xml application/xml+rss text/javascript;
  gzip_proxied  expired no-cache no-store private auth;

  error_page 500 502 503 504 /500.html;
  client_max_body_size 4G;
  keepalive_timeout 10;
}