``` func main() { router := gin.Default() // 匹配的url格式: /welcome?firstname=Jane&lastname=Doe router.GET("/welcome", func(c *gin.Context) { firstname := c.DefaultQuery("firstname", "Guest") lastname := c.Query("lastname") // 是 c.Request.URL.Query().Get("lastname") 的简写 c.String(http.StatusOK, "Hello %s %s", firstname, lastname) }) router.Run(":8080") } ```