How to rewrite request code from python 2 to golang?

Question

Python

There is no way to rewrite this code in golang. Source:

# -*- coding: utf-8 -*-
import urllib
import json
data['param1'] = '1'
data['param2'] = '2'
params = {}
params['access_token'] = '3e17b2be0282a44'
params['data'] = json.dumps(data)
params = urllib.urlencode(params)
f = urllib.urlopen("http://pbrf.ru/pdf.F7", params)
print f.read()

Attempt 1:

func Main() {
  req, err := http.NewRequest("GET", "http://pbrf.ru/pdf.F7", nil)
  if err != nil {
    log.Print(err)
    os.Exit(1)
  }

  q := req.URL.Query()
  addKeyAndValue(&q, Init2())
  req.URL.RawQuery = q.Encode()
  fmt.Println(req.URL.String())

  client := &http.Client{}
  req.Header.Add("Content-Type","application/x-www-form-urlencoded")
  resp, err := client.Do(req)
  checkErr(err);
  defer resp.Body.Close()
  resp_body, _ := ioutil.ReadAll(resp.Body)

  fmt.Println(resp.Status)
  fmt.Println(string(resp_body))
}

func addKeyAndValue(query *url.Values, parameters map[string]string) {
  for key, value := range parameters {
    query.Add(key, value)
  }
  return
}

Attempt 2:

func NewBlank() {

  type Request struct {
    Access_token string `json:"access_token"`
    Data  map[string]string `json:"data"`
  }

  u := Request{ "3e17b2be0282a44505",Init()}
  req, err := json.Marshal(u)
  checkErr(err)
  body := bytes.NewReader(req)
    fmt.Println(string(req))

  res, err := http.Post("http://pbrf.ru/pdf.F7", "application/json; charset=utf-8", body)
  checkErr(err)		

  bod, err := ioutil.ReadAll(res.Body)
  checkErr(err)

  msg := gjson.Get(string(bod), "message").String()
  println(msg)
}

Answer 1

The request must be POST.
Headers - application/x-www-form-urlencoded
You can check what is actually being sent by replacing the address with https://httpbin.org/post
Go example below

func Init() string {
  res := make(map[string]string)
  res["param1"] = "1"
  res["param2"] = "2"
  data, err := json.Marshal(res)
  checkErr(err)
  return string(data)
}

func NewBlank() {
  address := "http://pbrf.ru/pdf.F7"
  fmt.Println("URL:>", address)

  payload := url.Values{"access_token": []string{"3e17b2be0282a44505"}, "data": []string{Init()}}
  req, err := http.NewRequest("POST", address, bytes.NewBuffer([]byte(payload.Encode())))
  req.Header.Set("Content-Type", "application/x-www-form-urlencoded")

  client := &http.Client{}
  resp, err := client.Do(req)
  checkErr(err)
  defer resp.Body.Close()

  fmt.Println("response Status:", resp.Status)
  fmt.Println("response Headers:", resp.Header)
  body, _ := ioutil.ReadAll(resp.Body)
  fmt.Println("response Body:", string(body))