code: def handle_purge(environ, start_response):
      
      from utils import is_valid_security, get_cached_files
      from settings import DEBUG
      server = environ['SERVER_NAME']
      try:
          request_uri = get_path(environ)
          path_and_query = request_uri.lstrip("/")
          query_string = environ.get('QUERY_STRING', '')
          if is_valid_security('PURGE', query_string):
              cached_files = get_cached_files(path_and_query, server)
              for i in cached_files:
                  try:
                      os.remove(i)
                  except OSError as e:
                      return do_500(environ, start_response, e.message)
              start_response("204 No Content", [])
              return []
          else:
              return do_405(environ, start_response)
      except Http404 as e:
          return do_404(environ, start_response, e.message, DEBUG)
docs: Handle a PURGE request.