Golang GraphQL Client

golang-gql-client.go

package main

import (
	"bytes"
	"fmt"
	"io/ioutil"
	"net/http"
	"strconv"
)

const (
	URL    = "http://www.example.com/graphql"
	Cookie = "csrf_token=88a8a8a8a8a8a8a8a8a8a8a8=; token=9s9s9s9s9s9s9s9s9s9s9s9s9s9s9s9s9s9s9s9s9s9s9s9s9s9s9s9s9s9s9s9s9s9s9s9s9s9s9s9s9s9s9s9s9s9s9s9s9s9s9s9s9s9s9s9s9s9s9s9s9s9s9s9s9s9s9s9s9s9s9s9s=="
)

func main() {
	queries := []string{
		`mutation Update {
			user_update(
				user: {
					fname: "John",
					lname: "Smith",
				},
			) {
				fname
				lname
			}
		}`,
		`query User {
			user {
				fname
				lname
			}
		}`,
	}

	for _, query := range queries {
		makeRequest(queryToRequest(strconv.QuoteToASCII(query)))
	}
}

func queryToRequest(queryString string) string {
	return `{"query":` + queryString + `}`
}

func makeRequest(requestString string) {
 	// http://stackoverflow.com/questions/24455147/how-do-i-send-a-json-string-in-a-post-request-in-go
	fmt.Println("URL:", URL)

	var str = []byte(requestString)
	req, err := http.NewRequest("POST", URL, bytes.NewBuffer(str))
	req.Header.Set("Content-Type", "application/json")
	req.Header.Set("Cookie", Cookie)

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

	fmt.Println("Status:", resp.Status)
	body, _ := ioutil.ReadAll(resp.Body)
	fmt.Println("Body:", string(body))
}

I don't think you have to convert the requestString to byte array. The following change works too.

req, err := http.NewRequest("POST", URL, strings.NewReader(requestString))

Really helpful, thank you.