Long polling and HTTPS

Hi,

Is long polling compatible with HTTPS protocol? My application is set up to use WebSockets as primary transport and long polling as fallback. In Safari 8, websockets would fail and the transport would fall back to long polling if the certificate is invalid. However, I got this error message:

* WebSocket network error: OSStatus Error -9807: Invalid certificate chain
* Websocket closed, reason: Connection was closed abnormally (that is, with no close frame being sent).
* Websocket closed, wasClean: false
* Websocket failed. Downgrading to Comet and resending:
https://localhost/PUSH?v-uiId=4&v-csrfToken=42400973-f3cc-4118-9dae-c4cbab8f1b7d&X-Atmosphere-tracking-id=0&X-Atmosphere-Framework=2.2.6.vaadin5-jquery&X-Atmosphere-Transport=long-polling&X-Atmosphere-TrackMessageSize=true&Content-Type=application%2Fjson%3B%20charset%3DUTF-8&X-atmo-protocol=true&_=1441759216297
* Failed to load resource: the server responded with a status of 500 (Internal Server Error)

This is a MacOS + Safari only issue. It would be great if anyone has answers to my question or insights to share.

Thanks!