consumeapi.go

package main

import (
	"bytes"
	"encoding/json"
	"fmt"
	"io/ioutil"
	"log"
	"net/http"
)

func request1(url string) string {
	res, err := http.Get(url)
	if err != nil {
		log.Println(err)
	}
	var data []byte
	data, err = ioutil.ReadAll(res.Body)
	return string(data)
}

func post1(url string, jsonValue []byte) string {
	var (
		data []byte
		res  *http.Response
		err  error
	)
	res, err = http.Post(url, "application/json", bytes.NewBuffer(jsonValue))
	if err != nil {
		log.Fatal(err)
	}
	data, err = ioutil.ReadAll(res.Body)
	return string(data)
}

func reqClient(url string, jsonValue []byte) string {
	var (
		req  *http.Request
		res  *http.Response
		data []byte
		err  error
	)
	client := &http.Client{}
	req, err = http.NewRequest("POST", url, bytes.NewBuffer(jsonValue))
	if err != nil {
		log.Println(err)
	}
	req.Header.Set("Content-Type", "application/json")
	res, err = client.Do(req)
	if err != nil {
		log.Println(err)
	}
	data, err = ioutil.ReadAll(res.Body)
	if err != nil {
		log.Println(err)
	}
	return string(data)
}

func main() {
	jsonData := map[string]string{"firstname": "Nic", "lastname": "Raboy"}
	jsonValue, err := json.Marshal(jsonData)
	if err != nil {
		log.Println(err)
	}
	fmt.Println("Starting the application…")
	fmt.Println(request1("https://httpbin.org/ip"))
	fmt.Println(post1("https://httpbin.org/post", jsonValue))

	// using http.Client for control over:
	// - client headers
	// - redirect policy
	// - other settings
	fmt.Println(reqClient("https://httpbin.org/post", jsonValue))

}