Maximum number of http requests using web workers

Question

I know there is a limit on the number of concurrent http connections that can happen at a time in a browser...

Is this a total, overall browser limit? Are web-workers subject to this limit as well, or are they treated differently because they are different threads?

Answer 1

TLDR: Workers (in Chrome and Firefox at least) appear to adhere to a global max number of connections per host name.

I used this code to create a number of workers...

/* jshint esversion: 6 */

(function() {

    'use strict';

    const iWorkerCount = 20;

    for(let i = 0; i < iWorkerCount; i++) {
        const oWorker = new Worker('/js/worker.js');
    }

}());

... and then each worker made a remote request to an image service...

/* jshint esversion: 6 */

(function() {

    'use strict';

    const sUrl = 'https://loremflickr.com/320/240';

    fetch(sUrl).then(sResponse => {
        console.log(sResponse);
    });

}());

There's an initial batch of requests that complete at the same time and then the remaining requests trickle in shortly once the number max requests dips