<#-- Locale Header Check - TEMPORARY DIAGNOSTIC FRAGMENT Contains NO #assign statements. FreeMarker only emits raw header values into data- attributes using parenthesised chained defaults: (request.getHeader("X"))!((themeDisplay.getRequest().getHeader("X"))!"__ABSENT__") The parentheses make the ! default cover the ENTIRE expression, so a missing `request` object or an uncallable getHeader both fall through to the next accessor instead of throwing. All parsing, the rewrite decision and rendering happen in main.js. The raw Cookie header is deliberately NOT emitted - it contains the HttpOnly session id. main.js reads document.cookie instead, which exposes GUEST_LANGUAGE_ID (what we need) but never JSESSIONID. Delete this fragment and its page once the question is settled. --> <#if ((request.getParameter("diag"))!((themeDisplay.getRequest().getParameter("diag"))!"")) == ((configuration.diagKey)!"dh-locale-check") || (themeDisplay.isSignedIn())!false || ((layoutMode)!"view") != "view">