rss list with sinatra

controller.rb

#!/usr/bin/ruby
# -*- coding:utf-8 -*-

require 'sinatra'
require 'feedzirra'

atom_url = 'http://blog.takkyuuplayer.com/feeds/posts/summary'

get '/' do
  feed = Feedzirra::Feed.fetch_and_parse(atom_url)
  erb :index, :locals => { :feed => feed }
end

gistfile1.nginxconf

proxy_cache_path /var/cache/nginx/sinatra levels=1:2 keys_zone=cache_static_file:128m inactive=7d max_size=512m;
proxy_temp_path /var/cache/nginx/temp;

upstream sinatra {
  server localhost:4567;
}

server {
  listen       80;
  server_name www.takkyuuplayer.com;
  charset     utf-8;
  access_log  /var/log/nginx/vh/sinatra-access.log;
  error_log   /var/log/nginx/vh/sinatra-error.log;

  location / {
    proxy_redirect off;

    set $do_not_cache 0;
    if ($request_method != GET) {
      set $do_not_cache 1;
    }
    proxy_no_cache $do_not_cache;
    proxy_cache_bypass $do_not_cache;
    proxy_cache cache_static_file;
    proxy_cache_key $scheme$host$uri$is_args$args;
    proxy_cache_valid 200 2h;
    proxy_cache_valid any 1m;

    proxy_pass  http://sinatra;
    proxy_set_header  X-Real-IP $remote_addr;
    proxy_set_header  Host  $http_host;
  }

index.erb

<% feed.entries.each do |entry| %>
<li>
<a href="<%= entry.url %>" target="_blank">
    <%= entry.published.to_s[0, 10].gsub('-', '/') %>
    <%= entry.title %>
</a>
</li>
 <% end; %>