package main

import (
    "net/http"

    "github.com/jkrovnl/rkods/controllers"
    "github.com/julienschmidt/httprouter"
)

func main() {
    r := httprouter.New()
    uc := controllers.NewUserController()
    r.GET("/user/:id", uc.GetUser)
    r.POST("/user", uc.CreateUser)
    r.DELETE("/user/:id", uc.DeleteUser)
    http.ListenAndServe("localhost:8080", r)
}
===========================================
package models

// capital U because its gonna be exported
type User struct {
    Name   string `json:"name"`
    Gender string `json:"gender"`
    Age    int    `json:"age"`
    Id     string `json:"id"`
}
=============================================
package controllers

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

    "github.com/jkrovnl/rkods/models"
    "github.com/julienschmidt/httprouter"
)

type UserController struct{}

func NewUserController() *UserController {
    return &UserController{}
}

//Methods have to be capitalized to be exported, eg, GetUser and not getUser
func (uc UserController) GetUser(w http.ResponseWriter, r *http.Request, p httprouter.Params) {
    u := models.User{
        Name:   "James Bond",
        Gender: "male",
        Age:    32,
        Id:     p.ByName("id"),
    }
    uj, err := json.Marshal(u)
    if err != nil {
        fmt.Println(err)
    }
    w.Header().Set("Content-Type", "application/json")
    w.WriteHeader(http.StatusOK) // 200
    fmt.Fprintf(w, "%s\n", uj)
}

func (uc UserController) CreateUser(w http.ResponseWriter, r *http.Request, _ httprouter.Params) {
    u := models.User{}
    json.NewDecoder(r.Body).Decode(&u)
    u.Id = "007"
    uj, err := json.Marshal(u)
    if err != nil {
        fmt.Println(err)
    }
    w.Header().Set("Content-Type", "application/json")
    w.WriteHeader(http.StatusCreated) // 201
    fmt.Fprintf(w, "%s\n", uj)
}

func (uc UserController) DeleteUser(w http.ResponseWriter, r *http.Request, p httprouter.Params) {
    //TODO: only write code to delete user
    w.WriteHeader(http.StatusOK) // 200
    fmt.Fprint(w, "Write code to delete user \n")
}
=====================================================
Start your server
Enter this at the terminal
curl http://localhost:8080/user/1
curl -X POST -H "Content-Type: application/json" -d '{"Name":"James Bond","Gender":"male","Age":32,"Id":"777"}' http://localhost:8080/user
curl -X DELETE -H "Content-Type: application/json" http://localhost:8080/user/777