enableBasic = Config.getBoolean("jcifs.smb1.http.enableBasic", false);
        insecureBasic = Config.getBoolean("jcifs.smb1.http.insecureBasic", false);
        realm = Config.getProperty("jcifs.smb1.http.basicRealm");
        if (realm == null) {
            realm = "jCIFS";
        }
        defaultDomain = Config.getProperty("jcifs.smb1.smb.client.domain");

        level = Config.getInt("jcifs.smb1.util.loglevel", -1);

        insecureBasic = Boolean.parseBoolean(Config.getProperty("jcifs.smb1.http.insecureBasic"));
        realm = Config.getProperty("jcifs.smb1.http.basicRealm");
        if (realm == null) {
            realm = "jCIFS";
        }

        level = Config.getInt("jcifs.smb1.util.loglevel", -1);
        if (level != -1) {
            LogStream.setLevel(level);
        }

            this.realm = p.getProperty("jcifs.http.basicRealm");
            this.netbiosLookupRespLimit = Config.getInt(p, "jcifs.netbios.lookupRespLimit", 3);
            this.netbiosCacheTimeout = Config.getInt(p, "jcifs.netbios.cachePolicy", 60 * 10) * 60; /* 10 hours */

            if (this.realm == null) {
                this.realm = "jCIFS";
            }

        insecureBasicField.set(explorer, enableBasic);

        java.lang.reflect.Field realmField = NetworkExplorer.class.getDeclaredField("realm");
        realmField.setAccessible(true);
        realmField.set(explorer, realm);

        java.lang.reflect.Field defaultDomainField = NetworkExplorer.class.getDeclaredField("defaultDomain");
        defaultDomainField.setAccessible(true);

        verify(response).setStatus(HttpServletResponse.SC_UNAUTHORIZED);
        verify(response).setHeader("WWW-Authenticate", "NTLM");
        verify(response).addHeader("WWW-Authenticate", "Basic realm=\"TestRealm\"");
        verify(filterChain, never()).doFilter(any(), any());
    }

    @Test
    void testDoFilter_alreadyAuthenticated_shouldProceed() throws Exception {
        // Initialize filter first

If it doesn't receive it, it returns an HTTP 401 "Unauthorized" error.

And returns a header `WWW-Authenticate` with a value of `Basic`, and an optional `realm` parameter.

That tells the browser to show the integrated prompt for a username and password.

Then, when you type that username and password, the browser sends them in the header automatically.

 * get proper ticket caching.
 *
 * Be advised that short/NetBIOS name usage is not supported with this authenticator. Always specify full FQDNs/Realm.
 * This can be a problem if using DFS in it's default configuration as that still returns referrals in short form.
 * See <a href="https://support.microsoft.com/en-us/kb/244380">KB-244380</a> for compatible server configuration.

        ntlmServlet.service(request, response);

        verify(response).setHeader("WWW-Authenticate", "NTLM");
        verify(response).addHeader("WWW-Authenticate", "Basic realm=\"TestRealm\"");
        verify(response).setStatus(HttpServletResponse.SC_UNAUTHORIZED);
    }

    /**
     * Test the service method with a valid NTLM Authorization header.