code: def GET_namespace_names( self, path_info, namespace_id ):
          
          if not check_namespace(namespace_id):
              return self._reply_json({'error': 'Invalid namespace'}, status_code=400)
  
          qs_values = path_info['qs_values']
          page = qs_values.get('page', None)
          if page is None:
              log.error("Page required")
              return self._reply_json({'error': 'page= argument required'}, status_code=400)
  
          try:
              page = int(page)
              if page < 0:
                  raise ValueError()
  
          except ValueError:
              log.error("Invalid page")
              return self._reply_json({'error': 'Invalid page= value'}, status_code=400)
  
          offset = page * 100
          count = 100
  
          blockstackd_url = get_blockstackd_url()
          namespace_names = blockstackd_client.get_names_in_namespace(namespace_id, offset=offset, count=count, hostport=blockstackd_url)
          if json_is_error(namespace_names):
              # error
              status_code = namespace_names.get('http_status', 502)
              return self._reply_json({'error': namespace_names['error']}, status_code=status_code)
  
          self._reply_json(namespace_names)
          return
docs: Get the list of names in a namespace
          Reply the list of names in a namespace
          Reply 404 if the namespace doesn't exist
          Reply 502 for any error in talking to the blockstack server