I use IE 11 (v 11.0.9600.16521) and window 7 Enterprise edition.
I have a rest web service and browser based client and I enabed cross domain requests. In client side getAllReponses return list of all headers (including headers that I added to response in my server side application), but according to W3C Recommendations (16 January 2014) about Cross-Origin Resource Sharing <<User agents must filter out all response headers other than those that are a simple response header or of which the field name is an ASCII case-insensitive match for one of the values of the Access-Control-Expose-Headers headers (if any), before exposing response headers to APIs defined in CORS API specifications.>>
Simple response headers are the following:
Chrome, Mozilla works fine in this case, but IE does not filter headers :( .