Rack :: ResponseHeaders适合Sinatra [英] Rack::ResponseHeaders in rackup for Sinatra

问题描述

我认为这是一件很容易的事情，但我似乎无法做到。基本上，我试图使用Rack中间件将默认的Cache-Control标头设置为由我的Sinatra应用程序提供的所有响应。它看起来像Rack :: ResponseHeaders应该能够做到我需要的东西，但是当我尝试使用 here 在我的rackup文件中：

 使用Rack :: ResponseHeaders做|标题| 
 headers ['X-Foo'] ='bar'
 headers.delete（'X-Baz'）
 end 
  

我能够使Rack :: Cache成功运行，如下所示：

 使用Rack :: Cache，
：default_ttl => 3600 
  

然而，这并不能达到我想要的输出，而Rack :: ResponseHeaders可以提供罚款

仅供参考，我的网站托管在Heroku上，所需的Rack宝石在我的.gems清单中指定。

谢谢！

更新：完成一些研究之后，在已安装的rack-contrib（0.9.2）版本中找不到Rack :: ResponseHeaders。

如果有人有兴趣，我可以得到这个工作。看起来，在Heroku上安装 rack-contrib-0.9.3 并不容易，但我需要的唯一文件是 response_headers.rb ，所以我简单地将它复制到我的项目目录中，并按如下方式编辑我的机架：

  require'rack / contrib / response_headers'
 
＃设置默认缓存控制标题，如果没有设置Sinatra 
使用Rack :: ResponseHeaders do | headers | 
如果不是头['Cache-Control'] 
 headers ['Cache-Control'] =public，max-age = 3600
 end 
 end 
  

这为未指定显式高速缓存控制标头的对象设置1小时的默认最大时间在Sinatra–即静态资产。

I think this is a very easy one, but I can't seem to get it right. Basically, I'm trying to use Rack middleware to set a default Cache-Control header into all responses served by my Sinatra app. It looks like Rack::ResponseHeaders should be able to do exactly what I need, but I get an error when attempting to use the syntax demonstrated here in my rackup file:

use Rack::ResponseHeaders do |headers|
    headers['X-Foo'] = 'bar'
    headers.delete('X-Baz')
end

I was able to get Rack::Cache to work successfully as follows:

use Rack::Cache,
    :default_ttl => 3600

However, this doesn't achieve exactly the output I want, whereas Rack::ResponseHeaders gives fine-grained control of the headers.

FYI, my site is hosted on Heroku, and the required Rack gems are specified in my .gems manifest.

Thanks!

Update: After doing some research, it looks like the first issue is that Rack::ResponseHeaders is not found in the version of rack-contrib (0.9.2) which was installed. I'll start by looking into that.

解决方案

In case anyone's interested, I was able to get this working. It didn't look like there would be an easy way to install rack-contrib-0.9.3 on Heroku, but the only file I needed was response_headers.rb, so I simply copied this into my project directory and edited my rackup as follows:

require 'rack/contrib/response_headers'

# set default cache-control header if not set by Sinatra
use Rack::ResponseHeaders do |headers|
    if not headers['Cache-Control']
        headers['Cache-Control'] = "public, max-age=3600"
    end
end

This sets a default max-age of 1 hr on objects for which I'm not specifying an explicit Cache-Control header in Sinatra – namely, static assets.

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