jodd-servlet/src/main/java/jodd/servlet/ServletUtil.java
public static void requireAuthentication(final HttpServletResponse resp, final String realm) throws IOException {
		resp.setHeader(WWW_AUTHENTICATE, "Basic realm=\"" + realm + '\"');
		resp.sendError(HttpServletResponse.SC_UNAUTHORIZED);
	}
public static void requireAuthentication(final HttpServletResponse resp, final String realm) throws IOException {
		resp.setHeader(WWW_AUTHENTICATE, "Basic realm=\"" + realm + '\"');
		resp.sendError(HttpServletResponse.SC_UNAUTHORIZED);
	}
Sends correct headers to require basic authentication for the given realm.