Angular 6 HttpClient response has only some headers

Question

We have a use case in our REST implementation where it returns a special header that we use for pagination and determining the number of pages. I have modified the HttpClient options to observe the entire response. The response I see in chrome has this in its headers:

The special header is Content-Range and I see that in Chrome. When trying to get the Content-Range header in my subscription response, it is null. When debugging it turns out the headers array only has a subset of the actual headers.

I see folks talking about changing a server option to allow. We go through a servlet proxy. In development, all our responses have this:

private void setAccessControlHeaders(HttpServletResponse resp) {
    resp.setHeader("Access-Control-Allow-Origin", "*");
    resp.setHeader("Access-Control-Allow-Methods", "*");
    resp.setHeader("Access-Control-Allow-Headers", "*");
}

Is there something else I need to do to get access to a custom header?

Answer 1

I know that you need to add it like below

resp.setHeader("Access-Control-Expose-Headers", "Content-Range");

But can you tell me where this function you have is located?