Overflow/Significant resource overhead with maxContentLength

[Benedikt1992]

Describe the bug

When using the maxContentLength length option axios needs an ever growing amount of resources to download data and impacts the network stack of NodeJS in general (e.g. db modules loose their connection/can't establish a connection). This occurs especially with bigger files and multiple tasks. It takes sometime until the effect is visible. In short: more CPU, more RAM, less throughput.

To Reproduce

Code snippet to be run with nodejs:

import axios from 'axios';

async function start() {
    const urls = ['https://releases.ubuntu.com/20.04.2.0/ubuntu-20.04.2.0-desktop-amd64.iso?_ga=2.75943062.262255550.1619531518-988591408.1619531518',
        'https://cdimage.debian.org/debian-cd/current/arm64/iso-cd/debian-10.9.0-arm64-xfce-CD-1.iso',
        'http://ftp.tu-chemnitz.de/pub/linux/centos/8.3.2011/isos/x86_64/CentOS-8.3.2011-x86_64-dvd1.iso',
        'http://ftp.tu-chemnitz.de/pub/linux/centos/8.3.2011/isos/x86_64/CentOS-8.3.2011-x86_64-minimal.iso',
        'http://ftp.antilo.de/pub/linux/centos/8.3.2011/isos/x86_64/CentOS-8.3.2011-x86_64-minimal.iso',
        'http://centos.intergenia.de/8.3.2011/isos/x86_64/CentOS-8.3.2011-x86_64-minimal.iso'];
    const promises = urls.map((url) => axios.get(url, {
        maxContentLength: 4000000000, // ca. 3.7GB
    }));
    await Promise.all(promises);
    console.log('finish');
}
start();

GitHub Repo: https://github.com/Benedikt1992/axios-bug

Expected behavior

No negative (or less) impact on the resource consumption compared to the performance without maxContentLength.

Environment

• Axios Version 0.21.1
• Node.js Version 15.11.0, 12.21.0 and 12.22.1
• OS: Win10 with WSL2 and Ubuntu 20.04.1 LTS

Additional context/Screenshots

[DigitalBrainJS]

Overhead with maxContentLength was fixed in #3738 PR.
It's incredible that the line Buffer.concat (responseBuffer) .length> config.maxContentLength could have been in the codebase of a project like this for years. This is very painful for a perfectionist nature :)