HTTP GET and POST from HTTPS domain

Question

OK, so the basics of what I'm trying to do is send info from an AJAX webpage to a local app via a HTTP listening port. The web domain looks something like this --> https://coeus-dev.hosting.com:42122/Test/Example.html . it has a Submit button which does pretty much this --> "xmlhttp.open("GET", " http://localhost:4012/USP?unique=1470771541298&RequestType=Foo ", false);".

Using Fiddler I don't see any data come to the local host. I'm assuming that CORS is involved here some how but that just a total guess.

Bottom line: Why doesn't Fiddler see any traffic coming from the webpage to the localhost?

thanks!

Answer 1

It's not only a CORS problem, but a mixed-content too:

you can't make an http ajax request from an https webpage because the browser will block it for security reason.