Prevents uWaterloo's JobMine system from logging you out automatically

jobmine4days.user.js

// ==UserScript==
// @name         JobMine4Days
// @namespace    https://github.com/karlding
// @version      1.1
// @description  Prevents uWaterloo's JobMine system from logging you out automatically
// @author       Karl Ding
// @include      https://jobmine.ccol.uwaterloo.ca/psp/SS*
// @include      https://jobmine.ccol.uwaterloo.ca/psc/SS*
// @include      https://jobmine.ccol.uwaterloo.ca/psp/ES*
// @include      https://jobmine.ccol.uwaterloo.ca/psc/ES*
// @grant        none
// ==/UserScript==

window.addEventListener('load', function() {
    var poll = function() {
        var request = new XMLHttpRequest();
        var url = '//jobmine.ccol.uwaterloo.ca/psp/SS/EMPLOYEE/WORK/?cmd=resettimeout';
        request.open('GET', url, true);

        request.onload = function() {
            if (request.status >= 200 && request.status < 400) {
                console.log(request.responseText);
            } else {
                console.warn("Error: HTTP Status Code " + request.status);
            }
        };

        request.onerror = function(e) {
            console.warn("Error: Retrying request");
            setTimeout(function() {
                poll();
            }, 60000); // 60000ms = 1min
        };

        request.send();
    };
    // warningTimeoutMilliseconds / 2 = 1080000ms / 2 = 9min
    setInterval(poll, warningTimeoutMilliseconds / 2);
});