Rack::Deflater

config.ru

# Enable GZIP
use Rack::Deflater

rack_deflater_spec.rb

require 'spec_helper'

describe Rack::Deflater do
  it "produces an identical eTag whether content is deflated or not" do
    get "/api/acme"
    expect(response.headers["Content-Encoding"]).to be_nil
    etag = response.headers["Etag"]
    content_length = response.headers["Content-Length"].to_i
    
    get "/api/acme", {}, { "HTTP_ACCEPT_ENCODING" => "gzip" }
    expect(response.headers["Etag"]).to eql(etag)
    expect(response.headers["Content-Length"].to_i).to_not eql(content_length)
    expect(response.headers).to have_key("Content-Encoding")
    expect(response.headers["Content-Encoding"]).to eql("gzip")
  end
end