Check for invalid or unknown http status codes.

[AakifurRahman]

Nodejs http module does not throw any error for invalid ( undefined http response codes ) up to 999. Any typo ( like 209 instead of 208 [ Already Reported ] or 309 instead of 308 [ Permanent Redirect] ) might causes inconvenience at the frontend. An error message throw by express can prevent this.

Code:

const express = require("express");

const app = express();
const PORT = 8000

app.get("/", (req, res) => {
  res.status(209).json({
    data:"test"
  });
});

app.listen(PORT, () => {
  console.log("App is running");
});

Before change

1. The response data is passed.
2. Postman marks the status code as unknown

After change

1. A 500 - Internal Server Error is thrown
2. A error message is displayed ( TypeError: 209 is not a valid http status code. )

[dougwilson]

Duplicate of #4212