old_contents: from typing import Iterable, List, Tuple
  
  from werkzeug.http import HTTP_STATUS_CODES
  
  from apistar import http
  
  __all__ = ['WSGIEnviron', 'WSGIResponse']
  
  
  STATUS_CODES = {
      code: "%d %s" % (code, msg)
      for code, msg in HTTP_STATUS_CODES.items()
  }
  
  
  WSGIEnviron = http.WSGIEnviron
  
  
  class WSGIResponse(object):
      __slots__ = ('status', 'headers', 'iterator')
  
      def __init__(self,
                   status: str,
                   headers: List[Tuple[str, str]],
                   iterator: Iterable[bytes]) -> None:
          self.status = status
          self.headers = headers
          self.iterator = iterator
  
      @classmethod
      def build(cls, response: http.Response):
          try:
              status_text = STATUS_CODES[response.status]
          except KeyError:
              status_text = str(response.status)
  
          return WSGIResponse(
              status=status_text,
              headers=list(response.headers.items()),
              iterator=[response.content]
          )
  
new_contents: from typing import Iterable, List, Tuple
  
  from werkzeug.http import HTTP_STATUS_CODES
  
  from apistar import http
  
  __all__ = ['WSGIEnviron', 'WSGIResponse']
  
  
  STATUS_CODES = {
      code: "%d %s" % (code, msg)
      for code, msg in HTTP_STATUS_CODES.items()
  }
  
  ACCESS_CONTROL_ALLOW_ORIGIN = 'Access-Control-Allow-Origin'
  
  WSGIEnviron = http.WSGIEnviron
  
  
  class WSGIResponse(object):
      __slots__ = ('status', 'headers', 'iterator')
  
      def __init__(self,
                   status: str,
                   headers: List[Tuple[str, str]],
                   iterator: Iterable[bytes]) -> None:
          self.status = status
          self.headers = headers
          self.iterator = iterator
  
      @classmethod
      def build(cls, response: http.Response):
          try:
              status_text = STATUS_CODES[response.status]
          except KeyError:
              status_text = str(response.status)
  
          headers = list(response.headers.items())
  
          if ACCESS_CONTROL_ALLOW_ORIGIN not in response.headers:
              headers += [(ACCESS_CONTROL_ALLOW_ORIGIN, '*')]
  
          return WSGIResponse(
              status=status_text,
              headers=headers,
              iterator=[response.content]
          )
  
subject: Set "Access-Control-Allow-Origin: *" by default