context.go
func (ctx *Context) Redirect(code int, url string) {
	ctx.Response.Status = code
	ctx.Response.Data = url
}
func (ctx *Context) Redirect(code int, url string) {
	ctx.Response.Status = code
	ctx.Response.Data = url
}
// Redirect performs a redirecting to the url, if the code belongs to
// one of StatusMovedPermanently, StatusFound, StatusSeeOther, and
// StatusTemporaryRedirect.