HTTP Handler Functions

HTTP handler funksiyalari

Har bir handler ikkita narsa oladi: http.ResponseWriter (javob yozish uchun) va *http.Request (kelgan so'rov haqida ma'lumot). Bu ikkisi bilan ishlashni chuqurroq ko'ramiz.

example.go

package main

import (
	"fmt"
	"net/http"
	"net/http/httptest"
)

func infoHandler(w http.ResponseWriter, r *http.Request) {
	w.Header().Set("Content-Type", "text/plain")
	if r.Method != "GET" {
		w.WriteHeader(http.StatusMethodNotAllowed)
		fmt.Fprint(w, "faqat GET qabul qilinadi")
		return
	}
	w.WriteHeader(http.StatusOK)
	fmt.Fprintf(w, "Metod: %s, Yo'l: %s", r.Method, r.URL.Path)
}

func main() {
	req := httptest.NewRequest("GET", "/info", nil)
	rec := httptest.NewRecorder()
	infoHandler(rec, req)
	fmt.Println(rec.Code)
	fmt.Println(rec.Body.String())
}

w.Header().Set(...) javob sarlavhalarini o'rnatadi — bu `w.WriteHeader` chaqirilishidan oldin bo'lishi shart, chunki status kod yuborilgach sarlavhalarni o'zgartirib bo'lmaydi. w.WriteHeader(kod) status kodni yuboradi (http.StatusOK — 200, http.StatusMethodNotAllowed — 405 kabi tayyor konstantalar bor). r.Method va r.URL.Path — kelgan so'rov haqidagi asosiy ma'lumotlar.

>_ Exercise

Faqat POST metodini qabul qiladigan handler yozing.

•r.Method "POST" bo'lmasa, 405 status va "faqat POST" matnini qaytaring
•POST bo'lsa, 201 status va "yaratildi" matnini qaytaring

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Key Takeaway

Key Takeaway:

Handler ichida r.Methodni tekshirish, mos status kod bilan javob berish — HTTP serverlarning eng asosiy naqshlaridan biri.

NEXT UP

Routing and Path Parameters

OUTPUT

$ go run main.go
Kodingizni ishga tushiring