old_contents: import os, importlib
  
  RDFS = 'http://www.w3.org/2000/01/rdf-schema#'
  RDF = 'http://www.w3.org/1999/02/22-rdf-syntax-ns#'
  LDP = 'http://www.w3.org/ns/ldp#'
  XSD = 'http://www.w3.org/2001/XMLSchema#'
  DC = 'http://purl.org/dc/terms/'
  CE = 'http://ibm.com/ce/ns#'
  OWL = 'http://www.w3.org/2002/07/owl#'
  VCARD = 'http://www.w3.org/2006/vcard/ns#'
  FOAF = 'http://xmlns.com/foaf/0.1/'
  TRS = 'http://jazz.net/ns/trs#'
  AC = 'http://ibm.com/ce/ac/ns#'
  
  AC_T = 0x01
  AC_R = 0x02
  AC_C = 0x04
  AC_D = 0x08
  AC_W = 0x10
  AC_X = 0x20
  AC_ALL = AC_T|AC_R|AC_C|AC_D|AC_W|AC_X
  
  ADMIN_USER = 'http://ibm.com/ce/user/admin'
  ANY_USER = 'http://ibm.com/ce/user/any'
  
  # create and instance of a class from a #-separated module and class name (e.g., "some_module#SomeClass")
  def create_instance(module_and_class_name):
      parts = module_and_class_name.split('#')
      module_name = parts[0]
      class_name = parts[1]
      module = importlib.import_module(module_name)
      class_ = getattr(module, class_name)
      return class_()    
  
  if 'URL_POLICY_CLASS' in os.environ:
      URL_POLICY = create_instance(os.environ['URL_POLICY_CLASS'])
  else:
      #URL_POLICY = create_instance('url_policy#PathRootTenantURLPolicy')
      URL_POLICY = create_instance('url_policy#HostnameTenantURLPolicy')
  
new_contents: import os, importlib
  
  RDFS = 'http://www.w3.org/2000/01/rdf-schema#'
  RDF = 'http://www.w3.org/1999/02/22-rdf-syntax-ns#'
  LDP = 'http://www.w3.org/ns/ldp#'
  XSD = 'http://www.w3.org/2001/XMLSchema#'
  DC = 'http://purl.org/dc/terms/'
  CE = 'http://ibm.com/ce/ns#'
  OWL = 'http://www.w3.org/2002/07/owl#'
  VCARD = 'http://www.w3.org/2006/vcard/ns#'
  FOAF = 'http://xmlns.com/foaf/0.1/'
  TRS = 'http://jazz.net/ns/trs#'
  AC = 'http://ibm.com/ce/ac/ns#'
  
  AC_T = 0x01
  AC_R = 0x02
  AC_C = 0x04
  AC_D = 0x08
  AC_W = 0x10
  AC_X = 0x20
  AC_ALL = AC_T|AC_R|AC_C|AC_D|AC_W|AC_X
  
  ADMIN_USER = 'http://ibm.com/ce/user/admin'
  ANY_USER = 'http://ibm.com/ce/user/any'
  
  INTERNAL_RESOURCE_HOST = 'internal' # value of 'CE-Resource-Host' header used for internal http requests
  
  # create and instance of a class from a #-separated module and class name (e.g., "some_module#SomeClass")
  def create_instance(module_and_class_name):
      parts = module_and_class_name.split('#')
      module_name = parts[0]
      class_name = parts[1]
      module = importlib.import_module(module_name)
      class_ = getattr(module, class_name)
      return class_()    
  
  if 'URL_POLICY_CLASS' in os.environ:
      URL_POLICY = create_instance(os.environ['URL_POLICY_CLASS'])
  else:
      #URL_POLICY = create_instance('url_policy#PathRootTenantURLPolicy')
      URL_POLICY = create_instance('url_policy#HostnameTenantURLPolicy')
  
subject: add INTERNAL_RESOURCE_HOST constant