server.go
func (ctx *RequestCtx) NotFound() {
	ctx.Response.Reset()
	ctx.SetStatusCode(StatusNotFound)
	ctx.SetBodyString("404 Page not found")
}
func (ctx *RequestCtx) NotFound() {
	ctx.Response.Reset()
	ctx.SetStatusCode(StatusNotFound)
	ctx.SetBodyString("404 Page not found")
}
// NotFound resets response and sets '404 Not Found' response status code.