old_contents: 
  import superdesk
  
  from flask import current_app as app
  from superdesk.utils import ListCursor
  
  
  class ClientConfigResource(superdesk.Resource):
      item_methods = []
      public_methods = ['GET']
      resource_methods = ['GET']
  
  
  class ClientConfigService(superdesk.Service):
  
      def get(self, req, lookup):
          return ListCursor()
  
      def on_fetched(self, docs):
          docs['config'] = getattr(app, 'client_config', {})
  
  
  def init_app(app):
      superdesk.register_resource('client_config', ClientConfigResource, ClientConfigService, _app=app)
      app.client_config.update({
          'schema': app.config.get('SCHEMA'),
          'editor': app.config.get('EDITOR'),
      })
  
new_contents: 
  import superdesk
  
  from flask import current_app as app
  from superdesk.utils import ListCursor
  
  
  class ClientConfigResource(superdesk.Resource):
      item_methods = []
      public_methods = ['GET']
      resource_methods = ['GET']
  
  
  class ClientConfigService(superdesk.Service):
  
      def get(self, req, lookup):
          return ListCursor()
  
      def on_fetched(self, docs):
          docs['config'] = getattr(app, 'client_config', {})
  
  
  def init_app(app):
      superdesk.register_resource('client_config', ClientConfigResource, ClientConfigService, _app=app)
      app.client_config.update({
          'schema': app.config.get('SCHEMA'),
          'editor': app.config.get('EDITOR'),
          'feedback_url': app.config.get('FEEDBACK_URL'),
      })
  
subject: Add feedback url to served client configuration