method executed within hystrix behaving weiredly

[Kaustavd]

Hi,

Sample code:

	payload io.Reader) (bool, int) {
	
	//build request
	request, err := http.NewRequest(method, url, payload)
	if err != nil {
		log.Printf("failed in request build %s %s \n", url, err.Error())
		return false, 0
	}

	
	//make request
	response, err := h.HttpExecute(request)
	if err != nil {
		log.Println("HttpCommand=Error  URL=", url, " Error=", err)
		return false, 0
	} else {
		log.Println("HttpCommand=Success  response=", response, " error=", err)
		io.Copy(ioutil.Discard, response.Body)
		defer response.Body.Close()

		return true, response.StatusCode
	}
	
}

func (h *HTTPSink) HttpExecute(input *http.Request) (response *http.Response, err error){
	if err := hystrix.Do("http", func() (err error) {
		response, err = h.client.Do(input)
		return err
	}, nil); err != nil {
		return nil, err
	}
	return response, nil
}

In the above code response, err := h.HttpExecute(request) is behaving in non deterministic fashion. While running in debug mode err is coming as nil although destination server failed (4xx) but while executing the same line second time getting correct error

First invocation result

Second Invoction Result