Golang example

build string (concatinate string)

// build string config
output := strings.Join([]string{"Nodes.", config.NodeName, ".status"}, "")
fmt.Println(output)

golang post request example with body in json

package main

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

// struct for json answer from server
type serverResponse struct {
	Command string `json:"command"`
}

func main() {
	url := "http://localhost:3000/getJob"
	jsonStr := []byte(`{"nodeName":"node01", "index": "started"}`)

	req, err := http.NewRequest("POST", url, bytes.NewBuffer(jsonStr))
	req.Header.Set("Content-Type", "application/json") // importantly

	// init client
	client := &http.Client{}
	// go
	resp, err := client.Do(req)
	if err != nil {
		panic(err)
	}
	defer resp.Body.Close()

	// read body
	body, readErr := ioutil.ReadAll(resp.Body)
	if readErr != nil {
		log.Fatal(readErr)
	}

	// in struct json
	message := serverResponse{}
	jsonErr := json.Unmarshal(body, &message)
	if jsonErr != nil {
		log.Fatal(jsonErr)
	}

	fmt.Print(message.Command)

Read text file (txt plaintext)

	file, err := ioutil.ReadFile("/path/to/index.txt")
	if err != nil {
		fmt.Print(err)
	}
	str := string(file)
	fmt.Println(str)