package main

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

const (
  REQ_URL = "http://httpbin.org"
)

func main() {
  values := url.Values{}         // url.Valuesオブジェクト生成
  values.Add("param1", "値1") // key-valueを追加
  fmt.Println(values.Encode())

  getSimple(values)
  postSimple(values)

  client := &http.Client{Timeout: time.Duration(10 * time.Second)}
  get(client, values)
  post(client, values)
}

func getSimple(values url.Values) {
  // use http.Get (very simple)
  resp, err := http.Get(REQ_URL + "/get?" + values.Encode())
  if err != nil {
    fmt.Println(err)
    return
  }
  defer resp.Body.Close()

  execute(resp)
}

func postSimple(values url.Values) {
  // use http.PostForm (very simple)
  resp, err := http.PostForm(REQ_URL+"/post", values)
  if err != nil {
    fmt.Println(err)
    return
  }
  defer resp.Body.Close()

  execute(resp)
}

func get(client *http.Client, values url.Values) {
  req, err := http.NewRequest("GET", REQ_URL+"/get", nil)
  if err != nil {
    fmt.Println(err)
    return
  }

  req.URL.RawQuery = values.Encode()

  resp, err := client.Do(req)
  if err != nil {
    fmt.Println(err)
    return
  }
  defer resp.Body.Close()

  execute(resp)
}

func post(client *http.Client, values url.Values) {
  req, err := http.NewRequest("POST", REQ_URL+"/post", strings.NewReader(values.Encode()))
  if err != nil {
    fmt.Println(err)
    return
  }

  req.Header.Add("Content-Type", "application/x-www-form-urlencoded")

  resp, err := client.Do(req)
  if err != nil {
    fmt.Println(err)
    return
  }
  defer resp.Body.Close()

  execute(resp)
}

func execute(resp *http.Response) {
  // response bodyを文字列で取得するサンプル
  // ioutil.ReadAllを使う
  b, err := ioutil.ReadAll(resp.Body)
  if err == nil {
    fmt.Println(string(b))
  }
}