urlfetch.py 文件源码

def _is_fetching_self(url, method):
  """Checks if the fetch is for the same URL from which it originated.

  Args:
    url: str, The URL being fetched.
    method: value from _VALID_METHODS.

  Returns:
    boolean indicating whether or not it seems that the app is trying to fetch
      itself.
  """
  if (method != GET or
      "HTTP_HOST" not in os.environ or
      "PATH_INFO" not in os.environ):
    return False

  _, host_port, path, _, _ = urlparse.urlsplit(url)

  if host_port == os.environ['HTTP_HOST']:
    current_path = urllib2.unquote(os.environ['PATH_INFO'])
    desired_path = urllib2.unquote(path)

    if (current_path == desired_path or
        (current_path in ('', '/') and desired_path in ('', '/'))):
      return True

  return False