How do I get Jersey Test/Client to not fill in a default Accept header?

Question

I\'m trying to handle a request with no Accept header in a particular way, but Jersey seems hell-bent on filling one in, no matter what I do, so it always looks

Answer 1

Not sure if this helps anyone else but we were seeing similar behavior calling a service in production with our client code. We are using Jersey 2.21.1.

Expanded the code from the original post and found the following to be true:

• if Accept header is null then Jersey adds the default
• if Accept header is an empty String then an empty Accept header is used
• if Accept header has a value it is used

I'm not sure if there is a way to tell Jersey not to add the default value when a null is used.

public class JerseyAcceptHeaderTest extends JerseyTest {

    @Path("hello")
    public static class HelloResource {
        @GET
        public String getHello(@Context HttpHeaders httpHeaders) {
            String acceptHeader = httpHeaders.getHeaderString(HttpHeaders.ACCEPT);
            System.out.println("SERVER RECEIVED:" + acceptHeader);

            if (acceptHeader == null) {
                return "Null Accept Header";
            } else if (acceptHeader.equals("")) {
                return "No Accept Header";
            } else {
                return acceptHeader;
            }
        }
    }

    @Override
    protected Application configure() {
        return new ResourceConfig(HelloResource.class);
    }

    /**
     * this seems to be a bug in Jersey
     * it overrides a null Accept header
     */
    @Test
    public void test_accept_header_with_null() {
        final String acceptHeader = target("hello").request()
                .header(HttpHeaders.ACCEPT, null)
                .get(String.class);
        assertEquals("Null Accept Header", acceptHeader);
    }

    @Test
    public void test_accept_header_with_empty_string() {
        final String acceptHeader = target("hello").request()
                .header(HttpHeaders.ACCEPT, "")
                .get(String.class);
        assertEquals("No Accept Header", acceptHeader);
    }

    @Test
    public void test_accept_header_with_spaced_string() {
        final String acceptHeader = target("hello").request()
                .header(HttpHeaders.ACCEPT, "  ")
                .get(String.class);
        assertEquals("No Accept Header", acceptHeader);
    }

    @Test
    public void test_accept_header_with_value() {
        final String acceptHeader = target("hello").request()
                .header(HttpHeaders.ACCEPT, "application/json")
                .get(String.class);
        assertEquals("application/json", acceptHeader);
    }

}