Tabris.js XMLHttpRequests not accepting responses: readystate 1

Question

I have a tabris.js app that I needed to connect to a SQL database. In order to do so, I decided the best option would be to create an express REST API and then make XMLHttpRequests to it. When the app makes a request, the API shows that a GET request has been made and even responds with a result. I have tested it in a browser and found that the result is being returned flawlessly. The problem is that the readystate of the XHR never leaves 1 and therefore onload/onreadystatechange is never called. At one point I had this app working so I don't know what happened. I will include some mock API code and the Tabris.js code below.

API:

router.get('/', function(req, res) {
    res.json({Mock: 'Code'})
})

Tabris:

const xhr = new XMLHttpRequest()

xhr.onload = function() { /* Not called */ }
xhr.onerror = function() { /* Not called */ }
xhr.onabort = function() { /* Not called */ }
xhr.ontimeout = function() { /* Not called */ }

xhr.onreadystatechange = function() {
    switch (xhr.readyState) {
        case 1: console.log('opened, not sent'); break // Called
        case 2: console.log('sent, awaiting response'); break // Not called, even though the API gets the request
        case 3: console.log('response received, downloading'); break // Not called
        case 4: console.log('finished'); break // Not called
    }
}

xhr.open('GET', 'http://ip.ad.dr.ess:port/', true)
xhr.send()

I should also add that the fetch API is not working for me either, though similarly the request is received by the API.

Answer 1

So as it turns out, my code left completely the same, it started working this morning when I came in. For anyone experiencing the same issue, unfortunately I don't have a solid answer for you except that the last thing I did before it started working was updated tabris. Although this did nothing but replace the files I already had since I was up-to-date to begin with. I also tried testing it on another website which seemed to get it past the block it was having before. For me, I used http://ip.jsontest.com