code: def responses_callback(request):
      
      method = request.method
      headers = CaseInsensitiveDict()
      request_headers = CaseInsensitiveDict()
      request_headers.update(request.headers)
      request.headers = request_headers
      uri = request.url
      return StackInABox.call_into(method,
                                   request,
                                   uri,
                                   headers)
docs: Responses Request Handler.
  
      Converts a call intercepted by Responses to
      the Stack-In-A-Box infrastructure
  
      :param request: request object
  
      :returns: tuple - (int, dict, string) containing:
                        int - the HTTP response status code
                        dict - the headers for the HTTP response
                        string - HTTP string response