Code QuizAdvanced

Blocking the Event Loop

Spot the call that blocks Node's single-threaded event loop and defeats non-blocking I/O.

Codejavascript

const http = require('http');
const fs = require('fs');

http.createServer((req, res) => {
  const data = fs.readFileSync('./big-file.txt', 'utf8');
  res.end(data);
}).listen(3000);

What is the bug that hurts this server under concurrent requests?

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