Go non embedded with template

nonEmbeddedWithTemplate.go

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io/ioutil"
)

func main() {

	url := "https://APIKEYHERE:@api.hellosign.com/v3/signature_request/send_with_template"

	payload := strings.NewReader("------WebKitFormBoundary7MA4YWxkTrZu0gW\r\nContent-Disposition: form-data; name=\"client_id\"\r\n\r\nd7219512693825facdd9241f458decf2\r\n------WebKitFormBoundary7MA4YWxkTrZu0gW\r\nContent-Disposition: form-data; name=\"template_id\"\r\n\r\n06874015c4197f5b8d7a03f159095385d89c74d5\r\n------WebKitFormBoundary7MA4YWxkTrZu0gW\r\nContent-Disposition: form-data; name=\"test_mode\"\r\n\r\n1\r\n------WebKitFormBoundary7MA4YWxkTrZu0gW\r\nContent-Disposition: form-data; name=\"subject\"\r\n\r\nusing postman\r\n------WebKitFormBoundary7MA4YWxkTrZu0gW\r\nContent-Disposition: form-data; name=\"message\"\r\n\r\ntemplate non embedded\r\n------WebKitFormBoundary7MA4YWxkTrZu0gW\r\nContent-Disposition: form-data; name=\"signers[Signer][email_address]\"\r\n\r\nalex+postman1@hellosign.com\r\n------WebKitFormBoundary7MA4YWxkTrZu0gW\r\nContent-Disposition: form-data; name=\"signers[Signer][name]\"\r\n\r\nMr Postman\r\n------WebKitFormBoundary7MA4YWxkTrZu0gW\r\nContent-Disposition: form-data; name=\"custom_fields\"\r\n\r\n[{ \"name\":\"label1\", \"value\":\"things here aren't always what they seem\" } ]\r\n------WebKitFormBoundary7MA4YWxkTrZu0gW--")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("content-type", "multipart/form-data; boundary=----WebKitFormBoundary7MA4YWxkTrZu0gW")
	req.Header.Add("cache-control", "no-cache")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := ioutil.ReadAll(res.Body)

	fmt.Println(res)
	fmt.Println(string(body))

}