Only simple response headers are exposed when using CORS. Simple response headers are defined here . ETag is not a simple response headers.
If you want to expose non-simple headers, you need to set the Access-Control-Expose-Headers header, like so.
Have you ever tried AJAX 2.0 (Cross domain sharing) is a methodology fairly recently brought out by W3C: http://www.w3.org/TR/XMLHttpRequest2/#ref-cors.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.