Response.setAccessControlExposeHeaders(Set<String>) > NPE

[tarkal]

Trying to set the Access-Control-Expose-Headers in the response using Response.setAccessControlExposeHeaders(Set<String>) throws a Null Pointer Exception.

    @Override
    protected int beforeHandle(Request request, Response response) {
        Set<String> exposeHeaders = new HashSet<>();
        exposeHeaders.add("Authorization");
        exposeHeaders.add("Link");
        exposeHeaders.add("X-RateLimit-Limit");
        exposeHeaders.add("X-RateLimit-Remaining");
        exposeHeaders.add("Content-Type");
        response.setAccessControlExposeHeaders(exposeHeaders);
       ...
    }

Throws: NullPointerException

[tarkal]

Obviously this can be overcome by simply setting the header:

Series<Header> headers = response.getHeaders();
headers.set("Access-Control-Expose-Headers", "Authorization, Link, X-RateLimit-Limit, X-RateLimit-Remaining, Content-Type");

But the method should either be fixed or removed.

[thboileau]

Hi, I think this is a duplicate of this issue: #1150, could you confirm? Could you also indicate which version of the framework are you using?
It has been fixed in 2.3 branch. we will release 2.3.5 either today or tomorrow.
I need also to update the master branch (future 3.0), this will be done at the end of this week.