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@@ -81,7 +81,7 @@ spec = Gem::Specification.new do |s|
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   s.requirements << 'none'
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   s.add_dependency('activesupport', '= 2.3.0' + PKG_BUILD)
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-  s.add_dependency('rack', '= 0.4.0')
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+  s.add_dependency('rack', '>= 0.9.0')
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   s.require_path = 'lib'
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   s.autorequire = 'action_controller'

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@@ -31,7 +31,7 @@ rescue LoadError
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   end
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 end
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-gem 'rack', '~> 0.4.0'
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+gem 'rack', '>= 0.9.0'
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 require 'rack'
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 module ActionController

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@@ -4,7 +4,7 @@ uses_mocha 'integration' do
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 class SessionTest < Test::Unit::TestCase
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   StubApp = lambda { |env|
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-    [200, {"Content-Type" => "text/html"}, "Hello, World!"]
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+    [200, {"Content-Type" => "text/html", "Content-Length" => "13"}, "Hello, World!"]
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   }
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   def setup
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@@ -465,9 +465,9 @@ class MetalTest < ActionController::IntegrationTest
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   class Poller
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     def self.call(env)
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       if env["PATH_INFO"] =~ /^\/success/
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-        [200, {"Content-Type" => "text/plain"}, "Hello World!"]
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+        [200, {"Content-Type" => "text/plain", "Content-Length" => "12"}, "Hello World!"]
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       else
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-        [404, {"Content-Type" => "text/plain"}, '']
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+        [404, {"Content-Type" => "text/plain", "Content-Length" => "0"}, '']
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       end
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     end
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   end

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@@ -236,7 +236,12 @@ class RackResponseTest < BaseRackTest
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     status, headers, body = @response.to_a
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     assert_equal 200, status
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-    assert_equal({"Content-Type" => "text/html; charset=utf-8", "Cache-Control" => "no-cache", "Set-Cookie" => []}, headers)
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+    assert_equal({
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+      "Content-Type" => "text/html; charset=utf-8",
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+      "Content-Length" => "",
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+      "Cache-Control" => "no-cache",
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+      "Set-Cookie" => []
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+    }, headers)
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     parts = []
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     body.each { |part| parts << part }