Looks like we can't reproduce the issue or there's a problem in the test case provided.
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ST2 PR3 - Ajax request drops HTTPS
[INVALID] looks like I do have another issue, simple post do work.
Works as expected.
A simple post with Ext.Ajax.request(); with an "https://myurl" url will post on "http://myurl" and trigger cross-origin protection.
It does not look like there is a way to enable this, not sure it is a bug.
Using PR3, I did one using https and it sent a request using the https protocol.
Maybe we can compare configurations to see if we can reproduce it with a test case.
Looks like this one could be closed.