Upgraded rack

As Rack has some non backwards compatible changes added required
modifications to keep behaviour in rails close to same as before.

Also modified generators to include rack/rack for not yet released
version of rack

Gemfile

@@ -7,6 +7,7 @@ gemspec
 # ensure correct loading order
 gem 'mocha', '~> 0.14', require: false
 
+gem 'rack', github: 'rack/rack'
 gem 'rack-cache', '~> 1.2'
 gem 'jquery-rails', '~> 3.1.0'
 gem 'turbolinks'

actionpack/actionpack.gemspec

@@ -21,7 +21,7 @@ Gem::Specification.new do |s|
 
   s.add_dependency 'activesupport', version
 
-  s.add_dependency 'rack',      '~> 1.5.2'
+  s.add_dependency 'rack',      '~> 1.6.0.alpha'
   s.add_dependency 'rack-test', '~> 0.6.2'
   s.add_dependency 'actionview', version
 

actionpack/lib/action_dispatch/http/mime_negotiation.rb

@@ -54,8 +54,14 @@ module ActionDispatch
       end
 
       def formats
-        @env["action_dispatch.request.formats"] ||=
-          if parameters[:format]
+        @env["action_dispatch.request.formats"] ||= begin
+          params_readable = begin
+                              parameters[:format]
+                            rescue ActionController::BadRequest
+                              false
+                            end
+
+          if params_readable
             Array(Mime[parameters[:format]])
           elsif use_accept_header && valid_accept_header
             accepts
@@ -64,8 +70,8 @@ module ActionDispatch
           else
             [Mime::HTML]
           end
+        end
       end
-
       # Sets the \variant for template.
       def variant=(variant)
         if variant.is_a?(Symbol)

actionpack/test/dispatch/request/multipart_params_parsing_test.rb

@@ -8,7 +8,11 @@ class MultipartParamsParsingTest < ActionDispatch::IntegrationTest
     end
 
     def parse
-      self.class.last_request_parameters = request.request_parameters
+      self.class.last_request_parameters = begin
+        request.request_parameters
+      rescue EOFError
+        {}
+      end
       self.class.last_parameters = request.parameters
       head :ok
     end

actionpack/test/dispatch/request_test.rb

@@ -798,6 +798,12 @@ class RequestFormat < BaseRequestTest
     assert_not request.format.json?
   end
 
+  test "format does not throw exceptions when malformed parameters" do
+    request = stub_request("QUERY_STRING" => "x[y]=1&x[y][][w]=2")
+    assert request.formats
+    assert request.format.html?
+  end
+
   test "formats with xhr request" do
     request = stub_request 'HTTP_X_REQUESTED_WITH' => "XMLHttpRequest"
     request.expects(:parameters).at_least_once.returns({})
@@ -892,15 +898,15 @@ class RequestParameters < BaseRequestTest
     assert_equal({"bar" => 2}, request.query_parameters)
   end
 
-  test "parameters still accessible after rack parse error" do
+  test "parameters not accessible after rack parse error" do
     request = stub_request("QUERY_STRING" => "x[y]=1&x[y][][w]=2")
 
-    assert_raises(ActionController::BadRequest) do
-      # rack will raise a TypeError when parsing this query string
-      request.parameters
+    2.times do
+      assert_raises(ActionController::BadRequest) do
+        # rack will raise a TypeError when parsing this query string
+        request.parameters
+      end
     end
-
-    assert_equal({}, request.parameters)
   end
 
   test "we have access to the original exception" do

railties/lib/rails/generators/app_base.rb

@@ -200,10 +200,12 @@ module Rails
       def rails_gemfile_entry
         if options.dev?
           [GemfileEntry.path('rails', Rails::Generators::RAILS_DEV_PATH),
-           GemfileEntry.github('arel', 'rails/arel')]
+           GemfileEntry.github('arel', 'rails/arel'),
+           GemfileEntry.github('rack', 'rack/rack')]
         elsif options.edge?
           [GemfileEntry.github('rails', 'rails/rails'),
-           GemfileEntry.github('arel', 'rails/arel')]
+           GemfileEntry.github('arel', 'rails/arel'),
+           GemfileEntry.github('rack', 'rack/rack')]
         else
           [GemfileEntry.version('rails',
                             Rails::VERSION::STRING,