Where to insert Rack::Deflater in the rack?

I currently have the following:

use Rack::Rewrite
use Rack::Cache, {:verbose=>true, :metastore=>"memcached://localhost:11211/rack-cache/meta", :entitystore=>"memcached://localhost:11211/rack-cache/body"}
use Rack::Rewrite
use Rack::Lock
use Rack::Deflater
use ActionController::Failsafe
use #<Class:0x007fb34be9ac90>
use ActionController::Session::DalliStore, #<Proc:0x007fb34bea3638@(eval):8 (lambda)>
use Rails::Rack::Metal
use ActionController::ParamsParser
use Rack::MethodOverride
use Rack::Head
use ActionController::StringCoercion
use Sass::Plugin::Rack
use Hassle
use ActiveRecord::ConnectionAdapters::Connectio开发者_高级运维nManagement
use ActiveRecord::QueryCache
run ActionController::Dispatcher.new

I may be wrong, but wouldn't it make sense to move Deflater to the top? This way any and all traffic is gzipped.

Thanks for the help.

The simplest way to insert it is directly in your config.ru:

require ::File.expand_path('../config/environment',  __FILE__)
use Rack::Deflater
run My::Application

To confirm it is working start up your app and hit it with curl:

curl -i --head "Accept-Encoding: gzip,deflate" http://localhost:5000

Which should return the headers:

Vary: Accept-Encoding
Content-Encoding: gzip

And a beautifully gzipped response.

I had to insert it pretty early (before ActionDispatch::Static), like this:

# production.rb
config.middleware.insert_before ActionDispatch::Static, Rack::Deflater

You can use rake middleware to confirm (although this will look at your development settings)

> rake middleware
use Rack::Deflater
use ActionDispatch::Static
use Rack::Lock
use #<ActiveSupport::Cache::Strategy::LocalCache::Middleware:0x007f8e18455e90>
use Rack::Runtime
use Rack::MethodOverride
use ActionDispatch::RequestId
use Rails::Rack::Logger
use ActionDispatch::ShowExceptions
use ActionDispatch::DebugExceptions
use ActionDispatch::RemoteIp
use ActionDispatch::Reloader
use ActionDispatch::Callbacks
use ActionDispatch::Cookies
use ActionDispatch::Session::CookieStore
use ActionDispatch::Flash
use ActionDispatch::ParamsParser
use Remotipart::Middleware
use ActionDispatch::Head
use Rack::ConditionalGet
use Rack::ETag
use ActionDispatch::BestStandardsSupport
use Warden::Manager
use Rack::Mongoid::Middleware::IdentityMap
use Rack::Pjax
run MyApp::Application.routes

In response to Maletor, for how to exclude certain files from being gzip'd, see:

http://icelab.com.au/articles/wrapping-rack-middleware-to-exclude-certain-urls-for-rails-streaming-responses/

tried it (in Sinatra) and works great.