[BUG] auto replace non-breaking space (0xC2A0 with 0xA0) in node 24

[stels-cs]

This code behaves differently in Node.js 22 and Node.js 24.

In Node.js 24, the non-breaking space (the two-byte character 0xC2A0) is replaced with a single byte 0xA0

import express from 'ultimate-express';

const str = 'Text with non break spaceses';
console.log('nodejs', process.version, Buffer.from(str, 'utf-8').toString('hex'));

const app = express();
	app.get('/', (req, res) => {
		res.statusCode = 200;
		res.send(str);
})

app.listen(3000, () => {
    console.log('Server is running on port 3000');
});

Nodejs 24

> node index.js
nodejs v24.14.0 54657874c2a077697468c2a06e6f6ec2a0627265616bc2a07370616365736573
Server is running on port 3000
> curl http://localhost:3000/ | xxd
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100    28  100    28    0     0  10574      0 --:--:-- --:--:-- --:--:-- 14000
00000000: 5465 7874 a077 6974 68a0 6e6f 6ea0 6272  Text.with.non.br
00000010: 6561 6ba0 7370 6163 6573 6573            eak.spaceses

Nodejs 22

> node index.js
nodejs v22.16.0 54657874c2a077697468c2a06e6f6ec2a0627265616bc2a07370616365736573
Server is running on port 3000
> curl http://localhost:3000/ | xxd
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100    32  100    32    0     0   6064      0 --:--:-- --:--:-- --:--:--  6400
00000000: 5465 7874 c2a0 7769 7468 c2a0 6e6f 6ec2  Text..with..non.
00000010: a062 7265 616b c2a0 7370 6163 6573 6573  .break..spaceses

[nigrosimone]

I have tested the current source code on node 22 and node 24, express and ultimate-express log the same output

// issue 340

const express = require("express");

const app = express();

const str = "Text with non break spaceses";

console.log(
  "nodejs",
  process.version,
  Buffer.from(str, "utf-8").toString("hex"),
);

app.get("/", (req, res) => {
  res.statusCode = 200;
  res.send(str);
});

app.listen(13333, async() => {
  console.log("Server is running on port 13333");

   const responses = await fetch("http://localhost:13333/").then((res) =>
    res.text()
  );

  console.log(responses);

  process.exit(0);
});

[uNetworkingAB]

This can be the String optimization bug in uWS.js v20.64.0 & v20.63.0 that broke some JS Strings. Try updating all deps. It really sounds like it could be that bug.

[nigrosimone]

@dimdenGD the latest release is on v20.64.0 (has this bug), the master v20.66.0 (is fixed). Please, when you have free time, release a new version.