Web Development

net/http — Built-in HTTP Server

Go's standard library includes a production-ready HTTP server. No framework needed for simple APIs:

package main

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

type User struct {
    ID   int    `json:"id"`
    Name string `json:"name"`
}

func handleUsers(w http.ResponseWriter, r *http.Request) {
    users := []User{{1, "Alice"}, {2, "Bob"}}
    w.Header().Set("Content-Type", "application/json")
    json.NewEncoder(w).Encode(users)
}

func main() {
    http.HandleFunc("/api/users", handleUsers)
    http.ListenAndServe(":8080", nil)
}

Gin Framework

import "github.com/gin-gonic/gin"

func main() {
    r := gin.Default()

    r.GET("/users/:id", func(c *gin.Context) {
        id := c.Param("id")
        c.JSON(200, gin.H{"id": id, "name": "Alice"})
    })

    r.POST("/users", func(c *gin.Context) {
        var user User
        if err := c.ShouldBindJSON(&user); err != nil {
            c.JSON(400, gin.H{"error": err.Error()})
            return
        }
        c.JSON(201, user)
    })

    r.Run(":8080")
}

Practice Exercises