如何在Heroku Cedar上为静态Rack站点启用gzip压缩?

时间:2013-03-03 20:11:16

标签: heroku gzip rack deflate cedar

Creating Static Sites in Ruby with Rack文章之后,我在Heroku上获得了一个静态网站config.ru,如下所示:

use Rack::Static,
  :urls => ["/images", "/js", "/css"],
  :root => "public"

run lambda { |env|
  [
    200, 
    {
      'Content-Type'  => 'text/html', 
      'Cache-Control' => 'public, max-age=86400' 
    },
    File.open('public/index.html', File::RDONLY)
  ]
}

当我在结果上运行YSlow时,它报告没有文件被gzip压缩。如何压缩资产和public/index.html

1 个答案:

答案 0 :(得分:10)

来自我的previous experience与Sprockets,Sinatra和Rack::Deflater,我非常确定我只是远离我想要的use Rack::Deflater行。

我将config.ru更改为:

use Rack::Static,
  :urls => ["/images", "/js", "/css"],
  :root => "public"
use Rack::Deflater

run lambda # ...same as in the question

我能够验证响应是否已发送gzipped:

$ curl -H 'Accept-Encoding: gzip' http://localhost:9292 | file -
/dev/stdin: gzip compressed data

但不适用于/css/js/images下的静态资产:

$ curl -H 'Accept-Encoding: gzip' http://localhost:9292/css/bootstrap.min.css | file -
/dev/stdin: ASCII English text, with very long lines

那时我意识到这是一个标准的中间件堆栈 - Rack :: Static intercepts对静态文件的调用,从而跳过下面的堆栈!这就是为什么它适用于public/index.html但不适用于资产。

以下config.ru有效(请注意,use Rack::Deflater现在位于use Rack::Static之前):

use Rack::Deflater
use Rack::Static, 
  :urls => ["/images", "/js", "/css"],
  :root => "public"

run lambda { |env|
  [
    200, 
    {
      'Content-Type'  => 'text/html', 
      'Cache-Control' => 'public, max-age=86400' 
    },
    File.open('public/index.html', File::RDONLY)
  ]
}

验证:

$ curl -H 'Accept-Encoding: gzip' http://localhost:9292/css/bootstrap.min.css | file -
/dev/stdin: gzip compressed data, from Unix