EventSource fallback will not work with IE versions that support CSP

[LukasReschke]

With TP Microsoft is considering supporting the Content-Security-Policy, however it will most likely still not support EventSource's. Our fallback relies on Inline JavaScript and everything in regard to EventSource (Updating / Files handling / Gallery / etc…) will fail horribly once MS ships TP…

We need to adjust the CSP (maybe #13989 can help here) or somehow differently fix this behaviour…

[LukasReschke]

cc @icewind1991 fyi

[LukasReschke]

Also see https://status.modern.ie/contentsecuritypolicy

[oparoz]

The EventSource fallback just doesn't work period.

1. Install oC8
2. Click on the "Pictures" app in Internet Explorer 11
3. Stare at the spinning wheel forever
4. Look at the debugger. All the data is there, just never sent to where it's supposed to

I'm saying this in hope that the oC team will consider replacing OC_EventSource with a maintained polyfill and perhaps raise an issue there regarding upcoming changes in IE.

[LukasReschke]

@jnfrmarks Has this been tested?

[karlitschek]

@jnfrmarks Can you test?

[jnfrmarks]

@davitol

Can you please give this a try?

[oparoz]

I've tested Pictures with Azure RemoteApp and it crashes the browser.