FEATURE: support HEAD request to /user-api-key/new

This allows us to cleanly sniff to find if it exists

app/controllers/user_api_keys_controller.rb

@@ -6,7 +6,15 @@ class UserApiKeysController < ApplicationController
   skip_before_filter :check_xhr, :preload_json
   before_filter :ensure_logged_in, only: [:create, :revoke, :undo_revoke]
 
+  AUTH_API_VERSION ||= 1
+
   def new
+
+    if request.head?
+      head :ok, auth_api_version: AUTH_API_VERSION
+      return
+    end
+
     require_params
     validate_params
 
@@ -31,7 +39,6 @@ class UserApiKeysController < ApplicationController
 
     require_params
 
-
     unless SiteSetting.allowed_user_api_auth_redirects
                       .split('|')
                       .any?{|u| params[:auth_redirect] == u}

spec/controllers/user_api_keys_controller_spec.rb

@@ -44,6 +44,14 @@ TXT
     }
   end
 
+  context 'new' do
+    it "supports a head request cleanly" do
+      head :new
+      expect(response.code).to eq("200")
+      expect(response.headers["Auth-Api-Version"]).to eq("1")
+    end
+  end
+
   context 'create' do
 
     it "does not allow anon" do