POST method is supported, and to make a cross-domain https:// request your calling page would also need to be loaded over https. This is the best article I have found which explains these and other limitations of XDomainRequest in detail:
POST method is supported, and to make a cross-domain https:// request your calling page would also need to be loaded over https. This is the best article I have found which explains these and other limitations of XDomainRequest in detail: