Handle html format in addition to json

app/controllers/projects/clusters/gcp_controller.rb

@@ -27,6 +27,8 @@ class Projects::Clusters::GcpController < Projects::ApplicationController
           render json: { billing: redis.get(CheckGcpProjectBillingWorker.redis_shared_state_key_for(token_in_session)) }
         end
       end
+
+      format.html { render :check }
     end
   end

config/routes/project.rb

@@ -189,9 +189,9 @@ constraints(ProjectUrlConstrainer.new) do
             get '/user/new', to: 'clusters/user#new'
             post '/user', to: 'clusters/user#create'
-            get '/gcp/check', to: 'clusters/gcp#check'
             get '/gcp/new', to: 'clusters/gcp#new'
             get '/gcp/login', to: 'clusters/gcp#login'
+            get '/gcp/check', to: 'clusters/gcp#check'
             post '/gcp', to: 'clusters/gcp#create'
           end
         end