[golang] How to set cookie under gin

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setcookie example: 
import ( 
 "fmt" 
 "github.com/gin-gonic/gin" 
) 

func main() { 
 router := gin.Default() 
 router.GET("/cookie", func(c *gin.Context) { 
  // 设置cookie 
  c.SetCookie("site_cookie", "cookievalue", 3600, "/", "localhost", false, true) 
 }) 
 router.Run()
}
SetCookie函数定义： 
func (c *Context) SetCookie(name, value string, maxAge int, path, domain string, secure, httpOnly bool) 
special note: domain string must be correct. if not , SetCookie will be not write into right place. 

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