1 files changed, 8 insertions, 4 deletions
diff --git a/actionpack/lib/action_dispatch/testing/integration.rb b/actionpack/lib/action_dispatch/testing/integration.rb
index 0298962409..4dfd4f3f71 100644
--- a/actionpack/lib/action_dispatch/testing/integration.rb
+++ b/actionpack/lib/action_dispatch/testing/integration.rb
@@ -325,7 +325,11 @@ module ActionDispatch
           if path =~ %r{://}
             location = URI.parse(path)
             https! URI::HTTPS === location if location.scheme
-            host! "#{location.host}:#{location.port}" if location.host
+            if url_host = location.host
+              default = Rack::Request::DEFAULT_PORTS[location.scheme]
+              url_host += ":#{location.port}" if default != location.port
+              host! url_host
+            end
             path = location.query ? "#{location.path}?#{location.query}" : location.path
           end
 
@@ -355,10 +359,10 @@ module ActionDispatch
 
           # this modifies the passed request_env directly
           if headers.present?
-            Http::Headers.new(request_env).merge!(headers)
+            Http::Headers.from_hash(request_env).merge!(headers)
           end
           if env.present?
-            Http::Headers.new(request_env).merge!(env)
+            Http::Headers.from_hash(request_env).merge!(env)
           end
 
           session = Rack::Test::Session.new(_mock_session)
@@ -374,7 +378,7 @@ module ActionDispatch
           @html_document = nil
           @url_options = nil
 
-          @controller = session.last_request.env['action_controller.instance']
+          @controller = @request.controller_instance
 
           response.status
         end