go - Twitter oauth golang getting Error "code":32,"message":"Could not authenticate you." -

i trying implement signing in twitter account in golang. first step in trying request token. reference used mrjones's code available @ below link. https://github.com/mrjones/oauth/blob/master/examples/twitterserver/twitterserver.go

i getting following error. please let me know going wrong:

{"errors":[{"code":32,"message":"could not authenticate you."}]}

var twitterconf = &twitterconfig{     clientid:     " consumer key",     clientsecret: "my consumer key secret",     redirecturl:  "http://localhost:8080/oauth/twitteroauth2callback",      endpoint: serviceprovider{         requesttokenurl:   "https://api.twitter.com/oauth/request_token",         authorizetokenurl: "https://api.twitter.com/oauth/authorize",         accesstokenurl:    "https://api.twitter.com/oauth2/token",     }, }  func handletwitterlogin(res http.responsewriter, req *http.request, _ httprouter.params) {      ctx := appengine.newcontext(req)      params := url.values{}     params.add(callback_param, twitterconf.redirecturl)     params.add(consumer_key_param, twitterconf.clientid)     params.add(nonce_param, strconv.formatint(rand.new(rand.newsource(time.now().unixnano())).int63(), 10))     params.add(signature_method_param, signature_method_hmac+"sha1")     params.add(timestamp_param, strconv.formatint(time.now().unix(), 10))     params.add(version_param, oauth_version)     params.add("oauth_token", "my oauth token")      basestring := requeststring("post", twitterconf.endpoint.requesttokenurl, params)      signature, err6 := sign(basestring, "my token secret")      params.add(signature_param, signature)      url, err := url.parse(twitterconf.endpoint.requesttokenurl)      url.rawquery = params.encode()     firsturl := url.string()      reqnew, err2 := http.newrequest("post", firsturl, nil)     if err2 != nil {         log.errorf(ctx, "error in creating new request %+v ", err2)     }      reqnew.header.add("authorization", "oauth ")      client := urlfetch.client(ctx)      resp, err3 := client.do(reqnew)     if err3 != nil {         log.errorf(ctx, "error in doing client request  %+v ", err3)     }      bodybytes, err4 := ioutil.readall(resp.body)     resp.body.close()     log.infof(ctx, "handletwitterlogin 5 ")     if err4 != nil {         log.errorf(ctx, "error in readall resp body   %+v ", err4)     }      bodystr := string(bodybytes)  //here getting above mentioned error } 

these other functions used.

func requeststring(method string, url string, params url.values) string {     result := method + "&" + escape(url)      key, value := range params {         if len(value) > 0 {             result += escape("&")              result += escape(fmt.sprintf("%s=%s", key, value))         }     }     return result }  func sign(message string, tokensecret string) (string, error) {     key := escape(twitterconf.clientsecret) + "&" + escape(tokensecret)      h := hmac.new(crypto.sha1.new, []byte(key))     h.write([]byte(message))     rawsignature := h.sum(nil)      base64signature := base64.stdencoding.encodetostring(rawsignature)     return base64signature, nil } 

able solve problem. made 2 changes:

1. encoded params variables before passing encryption create signature

   basestring := "post"+"&"+ encode(twitterconf.endpoint.requesttokenurl) + "&"+encode(params.encode())

2. to create header, created own header string

       headerstring := "oauth oauth_callback=\"http%3a%2f%2flocalhost%3a8080%2foauth%2ftwitteroauth2callback\",oauth_consumer_key=\"consumerkey\",oauth_nonce=\"" +         params.get(nonce_param) + "\",oauth_signature=\"" + escape(signature) + "\",oauth_signature_method=\"hmac-sha1\",oauth_timestamp=\"" + params.get(timestamp_param) +         "\",oauth_token=\"" + escape("oauth token") + "\",oauth_version=\"1.0\"" 

   reqnew.header.add("authorization", headerstring)

this solved problem , started getting access token