Go公式のチュートリアルを進める
https://go.dev/doc/tutorial/web-service-gin

すでにGoは導入済みなので手順通りに進めてみます

$ mkdir web-service-gin
$ cd web-service-gin
$ go mod init example/web-service-gin
go: creating new go.mod: module example/web-service-gin

この階層にmain.goを作りチュートリアルをコピペする

main.go

package main

import (
	"net/http"
	"github.com/gin-gonic/gin"
)

// album represents data about a record album.
type album struct {
	ID     string  `json:"id"`
	Title  string  `json:"title"`
	Artist string  `json:"artist"`
	Price  float64 `json:"price"`
}

// albums slice to seed record album data.
var albums = []album{
	{ID: "1", Title: "Blue Train", Artist: "John Coltrane", Price: 56.99},
	{ID: "2", Title: "Jeru", Artist: "Gerry Mulligan", Price: 17.99},
	{ID: "3", Title: "Sarah Vaughan and Clifford Brown", Artist: "Sarah Vaughan", Price: 39.99},
}

func main() {
	router := gin.Default()
	router.GET("/albums", getAlbums)
	router.Run("localhost:8080")
}

// getAlbums responds with the list of all albums as JSON.
func getAlbums(c *gin.Context) {
	c.IndentedJSON(http.StatusOK, albums)
}

パッケージの取得

$ go get .
〜
go: downloading github.com/gin-gonic/gin v1.9.0
〜

実行

$ go run .
[GIN-debug] [WARNING] You trusted all proxies, this is NOT safe. We recommend you to set a value.
Please check https://pkg.go.dev/github.com/gin-gonic/gin#readme-don-t-trust-all-proxies for details.
[GIN-debug] Listening and serving HTTP on localhost:8080

リクエストを送付する

$ curl http://localhost:8080/albums
[
    {
        "id": "1",
        "title": "Blue Train",
        "artist": "John Coltrane",
        "price": 56.99
    },
    {
        "id": "2",
        "title": "Jeru",
        "artist": "Gerry Mulligan",
        "price": 17.99
    },
    {
        "id": "3",
        "title": "Sarah Vaughan and Clifford Brown",
        "artist": "Sarah Vaughan",
        "price": 39.99
    }
]

getに関しては問題なく動いたのでpostなどを順次試して行きます。