Json marshalling/unmarshalling with HTTP Get using Go

json_marshalling_and_http_get.go

package main

import (
	"encoding/json"
	"fmt"
	"net/http"
)

type person struct {
	UserId int    `json:"userId"`
	Id     int    `json:"id"`
	Title  string `json:"title"`
	Body   string `json:"body"`
}

type people []person

func main() {
	fmt.Printf("Listening on port 8080")
	http.HandleFunc("/test", func(responseWriter http.ResponseWriter, request *http.Request) {
		responseWriter.Write([]byte("Hello"))

		persons, err := query()
		if err != nil {
			http.Error(responseWriter, err.Error(), 500)
		}

		hello := people{person{}, person{}}
		fmt.Print(hello)
		topFivePeople := persons[0:5]

		responseWriter.Header().Set("Content-Type", "application/json; charset=utf-8")
		json.NewEncoder(responseWriter).Encode(topFivePeople)
	})

	http.ListenAndServe(":8080", nil)
}

func query() ([]person, error) {
	response, err := http.Get("http://jsonplaceholder.typicode.com/posts")

	if err != nil {
		return []person{}, err
	}

	defer response.Body.Close()

	var persons = people{}

	if err := json.NewDecoder(response.Body).Decode(&persons); err != nil {
		return []person{}, err
	}

	return persons, nil
}

func handler(w http.ResponseWriter, req *http.Request) {
	w.Header().Set("Content-Type", "text/plain")
	w.Write([]byte("This is an example server.\n"))
}