This is a pretty important issue, particularly when working with PhoneGap. PhoneGap will connect to remote services without CORS issues but local environment will not.
For insecure requests the ionic proxy is great but when the remote host is SSL any secure cookies are lost when they come back to the non-SSL browser.
This means for the many 3rd party services things like Login will fail when accessing through ionic service proxy.
++ for the ability to add any SSL cert to the proxy service. That will allow secure cookies to flowback to the client.
Off to configure MAMP (again). Sigh.