IFRAME/Javascript POST to different domain, any issues?

Hi,

I’d like to do the following:
-Javascript running in domain abc.com, create an 1×1 IFRAME. The IFRAME contains a form.
-Javascript then using HTTPS POST request, to post the form data to a different domain def.com.

The question is:
-With this implementation, will the POST request get blocked by some browser, or by the firewall, in other words, is this POST request reliable?

Somebody told me that this implementation is not reliable because it can be blocked by some firewall, but I didn’t think so.

I was wondering if anyone has the experiences on this can share.

Thanks.

Also in #HTML _↴