heimdall failing for ngnix

heimdallngnix.go

package main

import "github.com/gorilla/mux""
func GetRequestWithRawHttp(w http.ResponseWriter, r *http.Request) {
	api := "http://13.126.204.154/api/excel-report/v1/smart/live?reportName=agencyPerformanceReport&itemsperpage=10&pageNo=1&from=2018-02-22T12:10:19.441Z&to=2019-04-22T12:10:19.441Z"

	httpC := &http.Client{}
	req, err := http.NewRequest("GET", api, nil)
	tokenValue := r.Header["Authorization"]
	fmt.Println(tokenValue)
	req.Header.Add("Authorization", tokenValue[0])
	resp, err := httpC.Do(req)
	data, err := ioutil.ReadAll(resp.Body)
	var errorResponse *interface{}
	if resp.StatusCode != 200 {
		json.Unmarshal(data, &errorResponse)
		utils.ResponseWith(w, resp.StatusCode, errorResponse)
		return
	}
	fmt.Println("--err", err, resp.StatusCode)
	fmt.Println("--data", data)

	w.Write(data)
	return
}
//Heimdall Code 
func GetRequestWithHeimdall(w http.ResponseWriter, r *http.Request) {
	timeout := 1000 * time.Second
	client := httpclient.NewClient(httpclient.WithHTTPTimeout(timeout))
	api := "http://13.126.204.154/api/excel-report/v1/smart/live?reportName=agencyPerformanceReport&itemsperpage=10&pageNo=1&from=2018-02-22T12:10:19.441Z&to=2019-04-22T12:10:19.441Z"
	// api := constants.BaseUrl + constants.ApiVersion + "/manifests/4ffba45f-a10d-4b63-8b19-cb1e4104f1e5"
	req, err := client.Get(api, r.Header)
	if err != nil {
		utils.ResponseWith(w, req.StatusCode, err.Error())
		return
	}
	fmt.Println("--after")
	data, err := ioutil.ReadAll(req.Body)
	
	fmt.Println("--err", err, req.StatusCode)
	// fmt.Fprintf(w, string(data))
	w.Write(data)
	// utils.ResponseWith(w, req.St
	return
}

func main(){
        r := mux.NewRouter()
	r.HandleFunc("/api/rawhttp", GetRequestWithRawHttp).Methods("GET")
	r.HandleFunc("/api/heimdall", GetRequestWithHeimdall).Methods("GET")
	port :=":3016"
	fmt.Println("your app running on " + port)
	http.ListenAndServe(port,r)
}

edit made for response with different behavior