Heroku Cedar Stack - 机架缓存标题

Question

我无法想象我的生活.尝试使用Rack :: Cache来缓存Heroku上的一些静态公共页面,以及在它通过反向代理时执行操作缓存.

例如,这是我的"home"动作中的代码:

class StaticPagesController < ApplicationController
  layout 'public'

  caches_action :about, :contact, ......, :home, .....

  ......

  def home
    last_modified = File.mtime("#{Rails.root}/app/views/static_pages/home.html.haml")
    fresh_when last_modified: last_modified , public: true, etag: last_modified
    expires_in 10.seconds, :public => true       
  end

对于所有意图和目的,这应该有一个公共缓存控制标记,max-age 10 no？

$ curl -I http://myapp-staging.herokuapp.com/

HTTP/1.1 200 OK
Cache-Control: max-age=0, private, must-revalidate
Content-Type: text/html; charset=utf-8
Date: Thu, 24 May 2012 06:50:45 GMT
Etag: "997dacac05aa4c73f5a6861c9f5a9db0"
Status: 200 OK
Vary: Accept-Encoding
X-Rack-Cache: stale, invalid
X-Request-Id: 078d86423f234da1ac41b418825618c2
X-Runtime: 0.005902
X-Ua-Compatible: IE=Edge,chrome=1
Connection: keep-alive

我做错了什么吗？我觉得有一些陈旧的,无效的缓存响应...这是我第四次点击页面.

配置信息:

# Use a different cache store in production
config.cache_store = :dalli_store

config.action_dispatch.rack_cache = {
  :verbose      => true,
  :metastore => "memcached://#{ENV['MEMCACHE_SERVERS']}",
  :entitystore => "memcached://#{ENV['MEMCACHE_SERVERS']}"#,
}

# OLD : Disable Rails's static asset server (Apache or nginx will already do this)
config.serve_static_assets = true
config.static_cache_control = "public, max-age=2592000"

(也许有一种方法可以手动设置缓存控制标头？看起来应该有一种更简单的方法).

UPDATE

我甚至尝试将控制器操作降到最低限度:

def home
  expires_in 10.seconds, :public => true
  #last_modified = File.mtime("#{Rails.root}/app/views/static_pages/home.html.haml")
  #fresh_when last_modified: last_modified , public: true, etag: last_modified
end

它不起作用......

HTTP/1.1 200 OK
Server: nginx
Date: Thu, 24 May 2012 19:15:18 GMT
Content-Type: text/html; charset=utf-8
Connection: keep-alive
Status: 200 OK
X-Ua-Compatible: IE=Edge,chrome=1
Etag: "733798214c652f39ae79b4037e9111dc"
Cache-Control: max-age=0, private, must-revalidate
X-Request-Id: b33087fe0c2ae986c4cac88f14420b7c
X-Runtime: 0.006000
X-Rack-Cache: stale, invalid
Vary: Accept-Encoding
X-Varnish: 349105873
Age: 0
Via: 1.1 varnish

!

Answer 1

也许重新考虑整个事情并使用 Rails 缓存。新的cache_digests gem应该可以让你在rails级别上做你想做的事情变得微不足道： https: //github.com/rails/cache_digests

我敢打赌这会击败您的方法，其中包括每 10 秒执行一次文件系统调用来检查文件时间戳。