RangeError [ERR_HTTP_INVALID_STATUS_CODE]：无效状态代码：4

Question

I am getting this error when attempting to run my web application which is suppose to be a simple calculator.尝试运行我的 web 应用程序时出现此错误，该应用程序应该是一个简单的计算器。 I'm using Nodejs with the express.js framework.我将 Nodejs 与 express.js 框架一起使用。

this is my main js file:这是我的主要 js 文件：

const express = require('express');
const app = express();
const port = 3000;

app.use(express.urlencoded({ extended : true}));

app.use(express.json());

app.get("/", function(req, res){
 res.sendFile(__dirname + "/index.html");
 });

app.post("/", function(req, res){

    var num1 = Number(req.body.num1);

    var num2 = Number(req.body.num2);

    var result = Number(num1 + num2);

    res.send(result);

 });

app.listen(port, function(){
     console.log("SERVER STARTED ON PORT " + port);
});

this is my index.html code这是我的索引。html 代码

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Calculator</title>
</head>
<body>
    <h1>Calculator</h1>
    <form action="/" method="post">
        <input type="text" name="num1" placeholder="first number">
        <input type="text" name="num2" placeholder="second number">
        <button type="submit" name="submit">Calculate</button>
    </form>

</body>
</html>

and this is the error code I get in terminal:这是我在终端中得到的错误代码：

express deprecated res.send(status): Use res.sendStatus(status) instead calculator.js:23:9
RangeError [ERR_HTTP_INVALID_STATUS_CODE]: Invalid status code: 4
    at ServerResponse.writeHead (_http_server.js:255:11)
    at ServerResponse._implicitHeader (_http_server.js:246:8)
    at ServerResponse.end (_http_outgoing.js:811:10)
    at ServerResponse.send (/Users/<name>/Desktop/Calculator/node_modules/express/lib/response.js:221:10)
    at /Users/<>/Desktop/Calculator/calculator.js:23:9
    at Layer.handle [as handle_request] (/Users/<name>/Desktop/Calculator/node_modules/express/lib/router/layer.js:95:5)
    at next (/Users/<name>/Desktop/Calculator/node_modules/express/lib/router/route.js:137:13)
    at Route.dispatch (/Users/<name>/Desktop/Calculator/node_modules/express/lib/router/route.js:112:3)
    at Layer.handle [as handle_request] (/Users/<name>/Desktop/Calculator/node_modules/express/lib/router/layer.js:95:5)
    at /Users/<name>/Desktop/Calculator/node_modules/express/lib/router/index.js:281:22

that is all the info I can get/give.这就是我可以获得/提供的所有信息。

I have tried googling for answers but all I got was for error code: 0.我试过用谷歌搜索答案，但我得到的只是错误代码：0。

edit: I should note that i am fairly new to nodejs and express.js.编辑：我应该注意到我对 nodejs 和 express.js 相当陌生。

Answer 1

It would be better to make json out of your response, that would make it more extendable in the future, something like:最好将 json 排除在您的响应之外，这将使其在未来更具可扩展性，例如：

{value: result} Then sending it would work cause the json will be parsed as a string. {value: result} 然后发送它会起作用，因为 json 将被解析为字符串。 According to the express documentation you can't send a number in the res.send method as tkausl pointed out.根据快速文档，您不能像 tkausl 指出的那样在 res.send 方法中发送数字。

Answer 2

I had the same problem.我有同样的问题。 Just add some text to your result number.只需在您的结果编号中添加一些文本。 It will work.它会起作用的。

For example:例如：

res.send("This is your answer " + result);

When I did like this, the error disappeared.当我这样做时，错误消失了。

RangeError [ERR_HTTP_INVALID_STATUS_CODE]：无效状态代码：4

问题描述

2 个解决方案

解决方案1
0 已采纳 2021-04-18 20:14:47

解决方案2
0 2021-07-06 06:19:36

RangeError [ERR_HTTP_INVALID_STATUS_CODE]：无效状态代码：4

问题描述

2 个解决方案

解决方案1 0 已采纳 2021-04-18 20:14:47

解决方案2 0 2021-07-06 06:19:36

解决方案1
0 已采纳 2021-04-18 20:14:47

解决方案2
0 2021-07-06 06:19:36