Chrome, no response data after OPTIONS request?

Question

I'm using CORS to fetch some data from an API. All was working well until Chrome update launched a day ago.

Now after an OPTIONS request the subsequent request always returns with no response data.

If I click a button quickly twice it will show on the second request (the same one) since it's not making the pre-flight call.

I've re-installed and disabled all extensions, no idea what's going on here.

Is anyone else experiencing this?

EDIT note that the no response is directly from the devtools. It's just a n Ajax call. And even though it's not displaying any response data it's all working correctly. For instance if I do a console.log(res) in the code it's all good. It's strictly Chrome not showing any response and strictly following an OPTIONS (CORS) request.

EDIT Also note that everything is working and displaying perfectly fine in Firefox/Firebug.

EDIT Chrome Version 56.0.2924.87 (64-bit)

EDIT I'm just lost here. The app is working perfectly fine so it makes a bit hard to even know where to star debugging. It seemed to happen literally the day after Chrome popped up a green update icon. After that update I was seeing nil.

I checked some of my other apps and actually it works there! So I was thinking it might be related to some combination of plugin/Chrome not playing nicely. I tried reverting back a lot to many versions but not luck. Weird thing is that it's only following an OPTIONS request. I'm guessing it's something simple like an encoding type, but no idea where.

EDIT Also tried following some of the leader here with no luck: View AJAX response content in Chrome developer tools?

EDIT I have been able to narrow this down to an issue with vue-resource plugin. Works fine with axios. Fiddle is here: https://jsfiddle.net/tpnucv5m/

Answer 1

A quick fix, until the module is updated, is to comment out this line in dist/vue-resource.common.js:

xhr.responseType = 'blob';

It should be somewhere around line ~1054

Answer 2

I know this is not a solution (do not upvote), but right click the OPTIONS XHR and REPLAY XHR. It will resend the Ajax call and now there will be an answer.

I presume there is some async issue with the plugin.