REST API

Chi

• Show how chi works and how install it Link

Create a sample of GET

package main

import (
	"net/http"

	"github.com/go-chi/chi/v5"
)

func main() {
	r := chi.NewRouter()
	r.Get("/", func(w http.ResponseWriter, r *http.Request) {
		w.Write([]byte("Hello, world 2!"))
	})
	http.ListenAndServe(":3000", r)
}

Router param vs Query param

• Show the differences between they

r.Get("/{param}", func(w http.ResponseWriter, r *http.Request) {
	param := chi.URLParam(r, "param")
	w.Write([]byte(param))
})
r.Get("/", func(w http.ResponseWriter, r *http.Request) {
	param := r.URL.Query().Get("param")
	w.Write([]byte(param))
})

REST Client on VSCode

Extension

• Install extension
• Make a script as example

GET http://localhost:3000/?param=testea

Create a POST Method

• Explain what is payload
• GET does not have a body

r.Post("/campaign", func(w http.ResponseWriter, r *http.Request) {
		var campaign campaign

		err := render.DecodeJSON(r.Body, &campaign)
		if err != nil {
			http.Error(w, err.Error(), http.StatusBadRequest)
			return
		}
		campaign.Date = time.Now()
		render.JSON(w, r, campaign)
	})

Status Code

• Status code is a identifier of the http request where it can say if the resquest was ok or not.
• Code of 200 to 299 means that everything is ok
• Code of 400 to 499 means that is not ok and the request has a problem (something like data, securty or others)
• Code of 500 to 599 means that the server is crash

http.handler and http.handlerFunc

• What is http.handler and its interface
• what is http.handlerFunc and its code
• Why http.handler is not the default in our project

type myHandler struct {
	message string
}

func (m *myHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
	w.Write([]byte(m.message))
}

A good example of handlers is on link