API requests from localhost to Intranet not made u

Question

I have an application running on localhost that makes HTTP requests to a CORS-enabled Web API hosted on my Intranet. All api requests are successful using Chrome and Firefox, but I never see them in the IE 11 dev tools or Fiddler. Using Chrome and Firefox I can see the Origin header is set as expected. If the application is running on the Intranet (still a different domain from the api), the calls are successful using IE11. I've also gone through the Internet Options in IE and believe everything is set appropriately.

I'm hoping someone can either point out something obvious I'm missing or confirm that IE is broken and I just need to forget about it and move on.