package main

import (
    "bytes"
    "encoding/json"
    "log"
    "net/http"
)

func main() {

    message := map[string]interface{}{
        "username": "adm_bur",
        "password": "adm_bur",
    }

    bytesRepresentation, err := json.Marshal(message)
    if err != nil {
        log.Fatalln(err)
    }
    // Например
    resp, _ := http.Post("http://x.dev.smartcitycloud.ru/rest/login/", "application/json", bytes.NewBuffer(bytesRepresentation))
    if err != nil {
        log.Fatalln(err)
    }

    defer resp.Body.Close()

    log.Println(resp.Cookies())

}

// read cookie
//    var cookie,err = req.Cookie("testcookiename")
//    if err == nil {
//        var cookievalue = cookie.Value
//       io.WriteString(w, "<b>get cookie value is " + cookievalue + "</b>\n")
//  }