Only pass the host to the router when registering an application.

In produciton this was passing a full https url, which causes the router
clinet to register a backend_url with a port of 443.  This was wrong.

app/models/routable_artefact.rb

@@ -15,8 +15,10 @@ def router
   end
 
   def ensure_application_exists
-    backend_url = Plek.current.find(rendering_app)
-    router.update_application(rendering_app, backend_url)
+    backend_url = URI.parse Plek.current.find(rendering_app)
+    # Plek returns a full URL (https URL in production and preview).
+    # We only want to pass the host to the router.
+    router.update_application(rendering_app, backend_url.host)
   end
 
   def submit

features/support/registration_info.rb

@@ -40,7 +40,7 @@ def stub_search
 
   def stub_router
     WebMock.stub_request(:put, %r{^#{ROUTER_ROOT}/router/applications/.*$}).
-        with(:body => { "backend_url" => %r{^.*.test.gov.uk:80$} }).
+        with(:body => { "backend_url" => %r{^.*.test.gov.uk$} }).
         to_return(:status => 200, :body => "{}", :headers => {})
 
     # catch-all

test/unit/routable_artefact_test.rb

@@ -6,10 +6,22 @@ class RoutableArtefactTest < ActiveSupport::TestCase
     @routable = RoutableArtefact.new(@artefact)
   end
 
-  should "ensure that the application exists in the router" do
-    Router.any_instance.expects(:update_application).with("bee", "http://bee.test.gov.uk")
-    Router.any_instance.stubs(:create_route)
-    @routable.submit
+  context "registering the application" do
+    should "ensure that the application exists in the router" do
+      Router.any_instance.expects(:update_application).with("bee", "bee.test.gov.uk")
+      Router.any_instance.stubs(:create_route)
+      @routable.submit
+    end
+
+    should "strip the scheme from the URL returned by Plek" do
+      # Plek returns the external URL's for applications, this is the HTTPS version
+      # in preview and production.  If an https URL is passed to the router, it gets confused.
+      Plek.any_instance.stubs(:find).with('bee').returns("https://bee.test.gov.uk")
+
+      Router.any_instance.expects(:update_application).with("bee", "bee.test.gov.uk")
+      Router.any_instance.stubs(:create_route)
+      @routable.submit
+    end
   end
 
   should "create a full route for the slug" do
@@ -64,7 +76,7 @@ class RoutableArtefactTest < ActiveSupport::TestCase
     # Was previously using the publically visible hostname (www...) which was breaking things.
     Plek.stubs(:current_env).returns('production')
     @artefact.update_attributes!(:owning_app => 'frontend')
-    Router.any_instance.expects(:update_application).with("frontend", "https://frontend.production.alphagov.co.uk")
+    Router.any_instance.expects(:update_application).with("frontend", "frontend.production.alphagov.co.uk")
     Router.any_instance.stubs(:create_route)
     @routable.submit
   end