[Bug] [iOS] JSON serialization manipulates number values in POST request body

Describe the bug There’s a problem of serializing a POST body with number values (iOS only). By sending a number value, for example: 0.1 in the POST body and by using JSON as dataSerializer in this plugin, I receive the passed 0.1 as 0.10000000000000001 on the server side erroneously. The problem only occurs by setting the dataSerializer to json.

System info

• affected HTTP plugin version: 2.4.1
• affected platform(s) and version(s): iOS 12.4.3
• affected device(s): iPhone 6
• cordova version: 9.0.0
• cordova platform version(s): cordova-ios 5.1.1

Minimum viable code to reproduce For reproduction you can make a simple POST request to a server. I created a small node server to log the request post body to console:

const http = require("http");
const server = http.createServer((req, res) => {
  let body = '';
  req.on('data', chunk => {
    body += chunk.toString(); // convert Buffer to string
  });
  req.on('end', () => {
    console.log(body);
    res.end('ok');
  });
});
server.listen(8888);

Now send a POST request with a number value causing the double-precision problem like 0.1 in the body and set the dataSerializer to json. (Replace <your-ip-address> with your ip address and make sure your iPhone is in the same network as your node-server / desktop pc)

cordova.plugin.http.setDataSerializer('json');
cordova.plugin.http.post('http://<your-ip-address>:8888', { myNumber: 0.1 }, {}).then(console.log, console.log);

In your server console you get:

{"myNumber":0.10000000000000001}

but the expected request would be:

{"myNumber":0.1}

[trplx]

@silkimen Any updates on this bug?

[alxpsr]

Need bugfix guys 😦