context.go
func (ctx *Context) GetCookie(name string) string {
	cookie, err := ctx.Req.Cookie(name)
	if err != nil {
		return ""
	}
	val, _ := url.QueryUnescape(cookie.Value)
	return val
}
func (ctx *Context) GetCookie(name string) string {
	cookie, err := ctx.Req.Cookie(name)
	if err != nil {
		return ""
	}
	val, _ := url.QueryUnescape(cookie.Value)
	return val
}
// GetCookie returns given cookie value from request header.