Cookie
cookieの設定と取得
import (    "fmt"
    "github.com/gin-gonic/gin")
func main() {
    router := gin.Default()
    router.GET("/cookie", func(c *gin.Context) {
        cookie, err := c.Cookie("gin_cookie")
        if err != nil {            cookie = "NotSet"            c.SetCookie("gin_cookie", "test", 3600, "/", "localhost", false, true)        }
        fmt.Printf("Cookie value: %s \n", cookie)    })
    router.Run()}Delete cookie by set max age to -1.
c.SetCookie("gin_cookie", "test", -1, "/", "localhost", false, true)