6 files changed, 70 insertions, 2 deletions
diff --git a/actionpack/lib/abstract_controller/base.rb b/actionpack/lib/abstract_controller/base.rb
index d4317399ed..aa06f70433 100644
--- a/actionpack/lib/abstract_controller/base.rb
+++ b/actionpack/lib/abstract_controller/base.rb
@@ -150,6 +150,13 @@ module AbstractController
       _find_action_name(action_name)
     end
 
+    # Tests if a response body is set. Used to determine if the
+    # +process_action+ callback needs to be terminated in
+    # +AbstractController::Callbacks+.
+    def performed?
+      response_body
+    end
+
     # Returns true if the given controller is capable of rendering
     # a path. A subclass of +AbstractController::Base+
     # may return false. An Email controller for example does not
diff --git a/actionpack/lib/abstract_controller/callbacks.rb b/actionpack/lib/abstract_controller/callbacks.rb
index d63ce9c1c3..3ef8da86fa 100644
--- a/actionpack/lib/abstract_controller/callbacks.rb
+++ b/actionpack/lib/abstract_controller/callbacks.rb
@@ -9,7 +9,7 @@ module AbstractController
 
     included do
       define_callbacks :process_action,
-                       terminator: ->(controller, result_lambda) { result_lambda.call if result_lambda.is_a?(Proc); controller.response_body },
+                       terminator: ->(controller, result_lambda) { result_lambda.call if result_lambda.is_a?(Proc); controller.performed? },
                        skip_after_callbacks_if_terminated: true
     end
 
diff --git a/actionpack/lib/action_dispatch/routing/mapper.rb b/actionpack/lib/action_dispatch/routing/mapper.rb
index 8ff3b42a40..40b6500553 100644
--- a/actionpack/lib/action_dispatch/routing/mapper.rb
+++ b/actionpack/lib/action_dispatch/routing/mapper.rb
@@ -106,7 +106,7 @@ module ActionDispatch
           @ast                = ast
           @anchor             = anchor
           @via                = via
-          @internal           = options[:internal]
+          @internal           = options.delete(:internal)
 
           path_params = ast.find_all(&:symbol?).map(&:to_sym)
 
diff --git a/actionpack/test/controller/integration_test.rb b/actionpack/test/controller/integration_test.rb
index 97571c1308..34fb3b1003 100644
--- a/actionpack/test/controller/integration_test.rb
+++ b/actionpack/test/controller/integration_test.rb
@@ -1147,6 +1147,22 @@ class IntegrationRequestEncodersTest < ActionDispatch::IntegrationTest
     end
   end
 
+  def test_standard_json_encoding_works
+    with_routing do |routes|
+      routes.draw do
+        ActiveSupport::Deprecation.silence do
+          post ':action' => FooController
+        end
+      end
+
+      post '/foos_json.json', params: { foo: 'fighters' }.to_json,
+        headers: { 'Content-Type' => 'application/json' }
+
+      assert_response :success
+      assert_equal({ 'foo' => 'fighters' }, response.parsed_body)
+    end
+  end
+
   def test_encoding_as_json
     post_to_foos as: :json do
       assert_response :success
diff --git a/actionpack/test/controller/send_file_test.rb b/actionpack/test/controller/send_file_test.rb
index 2820425c31..9df70dacbf 100644
--- a/actionpack/test/controller/send_file_test.rb
+++ b/actionpack/test/controller/send_file_test.rb
@@ -11,6 +11,8 @@ class SendFileController < ActionController::Base
   include ActionController::Testing
   layout "layouts/standard" # to make sure layouts don't interfere
 
+  before_action :file, only: :file_from_before_action
+
   attr_writer :options
   def options
     @options ||= {}
@@ -20,6 +22,10 @@ class SendFileController < ActionController::Base
     send_file(file_path, options)
   end
 
+  def file_from_before_action
+    raise 'No file sent from before action.'
+  end
+
   def test_send_file_headers_bang
     options = {
       :type => Mime[:png],
@@ -192,6 +198,15 @@ class SendFileTest < ActionController::TestCase
     assert_nil @controller.headers['Content-Disposition']
   end
 
+  def test_send_file_from_before_action
+    response = nil
+    assert_nothing_raised { response = process('file_from_before_action') }
+    assert_not_nil response
+
+    assert_kind_of String, response.body
+    assert_equal file_data, response.body
+  end
+
   %w(file data).each do |method|
     define_method "test_send_#{method}_status" do
       @controller.options = { :stream => false, :status => 500 }
diff --git a/actionpack/test/dispatch/routing_test.rb b/actionpack/test/dispatch/routing_test.rb
index ade4b0c381..75fdc9469f 100644
--- a/actionpack/test/dispatch/routing_test.rb
+++ b/actionpack/test/dispatch/routing_test.rb
@@ -4795,3 +4795,33 @@ class TestPathParameters < ActionDispatch::IntegrationTest
     assert_equal "/ar | /ar/about", @response.body
   end
 end
+
+class TestInternalRoutingParams < ActionDispatch::IntegrationTest
+  Routes = ActionDispatch::Routing::RouteSet.new.tap do |app|
+    app.draw do
+      get '/test_internal/:internal' => 'internal#internal'
+    end
+  end
+
+  class ::InternalController < ActionController::Base
+    def internal
+      head :ok
+    end
+  end
+
+  APP = build_app Routes
+
+  def app
+    APP
+  end
+
+  def test_paths_with_partial_dynamic_segments_are_recognised
+    get '/test_internal/123'
+    assert_equal 200, response.status
+
+    assert_equal(
+      { controller: 'internal', action: 'internal', internal: '123' },
+      request.path_parameters
+    )
+  end
+end