Safari 7 infinite POST request

I've get stuck with such issue. I have a form. When user submits his data, I'm sending some data via post ajax request. On success I set some data to hidden form, which has action pointing to current url subdomain, but in fact to partner site url that is set over CNAME. Then I trigger jQuery submit event on this hidden form, so after response user is on partner site (hidden form has no target attribute). It works fine in any browser except Safari 7 on mac. It just load for infinite time.

Any help is appreciated.