How do I send a JSON string in a POST request in Go

Question

I tried working with Apiary and made a universal template to send JSON to mock server and have this code:

package main  import (     "encoding/json"     "fmt"     "github.com/jmcvetta/napping"     "log"     "net/http" )  func main() {     url := "http://restapi3.apiary.io/notes"     fmt.Println("URL:>", url)      s := napping.Session{}     h := &http.Header{}     h.Set("X-Custom-Header", "myvalue")     s.Header = h      var jsonStr = []byte(` {     "title": "Buy cheese and bread for breakfast." }`)      var data map[string]json.RawMessage     err := json.Unmarshal(jsonStr, &data)     if err != nil {         fmt.Println(err)     }      resp, err := s.Post(url, &data, nil, nil)     if err != nil {         log.Fatal(err)     }     fmt.Println("response Status:", resp.Status())     fmt.Println("response Headers:", resp.HttpResponse().Header)     fmt.Println("response Body:", resp.RawText())  } 

This code doesn't send JSON properly, but I don't know why. The JSON string can be different in every call. I can't use Struct for this.

Answer 1

I'm not familiar with napping, but using Golang's net/http package works fine (playground):

func main() {     url := "http://restapi3.apiary.io/notes"     fmt.Println("URL:>", url)      var jsonStr = []byte(`{"title":"Buy cheese and bread for breakfast."}`)     req, err := http.NewRequest("POST", url, bytes.NewBuffer(jsonStr))     req.Header.Set("X-Custom-Header", "myvalue")     req.Header.Set("Content-Type", "application/json")      client := &http.Client{}     resp, err := client.Do(req)     if err != nil {         panic(err)     }     defer resp.Body.Close()      fmt.Println("response Status:", resp.Status)     fmt.Println("response Headers:", resp.Header)     body, _ := ioutil.ReadAll(resp.Body)     fmt.Println("response Body:", string(body)) }