fix routing for domain rss feeds

config/routes.rb

@@ -70,7 +70,8 @@ Rails.application.routes.draw do
   get "/t/:tag" => "home#multi_tag", :as => "multi_tag"
   get "/t/:tag/page/:page" => "home#tagged"
 
-  get "/domain/:name" => "home#for_domain", :as => "domain", :constraints => { name: /[^\/]+/ }
+  get "/domain/:name(.:format)" => "home#for_domain", :as => "domain",
+    :constraints => { name: /[^\/]+?/, format: /json|rss/ }
   get "/domain/:name/page/:page" => "home#for_domain", :constraints => { name: /[^\/]+/ }
 
   get "/search" => "search#index"

spec/routing/home_spec.rb

@@ -0,0 +1,17 @@
+require 'rails_helper'
+
+describe 'home routing' do
+  it 'routes a domain' do
+    assert_recognizes(
+      { controller: 'home', action: 'for_domain', name: 'example.com' },
+      '/domain/example.com'
+    )
+  end
+
+  it 'routes a domain rss feed' do
+    assert_recognizes(
+      { controller: 'home', action: 'for_domain', name: 'example.com', format: 'rss' },
+      '/domain/example.com.rss'
+    )
+  end
+end