context.go
func (ctx *Context) Redirect(url string, code int) {
	http.Redirect(ctx.ResponseWriter, ctx.Request, url, code)
}
func (ctx *Context) Redirect(url string, code int) {
	http.Redirect(ctx.ResponseWriter, ctx.Request, url, code)
}
// Redirect Redirect replies to the request with a redirect to url, which may be a path relative to the request path.