Story details: https://app.shortcut.com/particle/story/132018

Firefox has an inexplicable behavior where doing multiple fetch calls to the same endpoint with the same parameters makes the second request stall. It doesn't resolve or reject. Chrome and Edge do not have this issue.

One workaround I found is to use a different path by passing a nonce. We can discuss in a broader team what might be going on but it's sufficient to fix the issue for now.

Steps to test:

const particle = new Particle();
particle.getEventStream({ deviceId: '250029001550483553353620', product: 8178, auth }).then(stream => {
    console.log('event stream 1 connected');
});
particle.getEventStream({ deviceId: '250029001550483553353620', product: 8178, auth }).then(stream => {
    console.log('event stream 2 connected');
});

Expect to see both log lines. In Chrome, this is the case. In Firefox, before the fix, only the first log is shown.