Describe the bug
I used the new sendWithPromise() function in a project and waited forever to settle. It turns out it wasn't sending the request.
Steps to reproduce the behavior:
Use sendWithPromise() in a qx.io.request.Xhr. Wait for the result's to come. The request is not even sent. No trace of the communication in browser's network tab in the developer tools.
Returned promise should settle after a while.