Assistant: 
User: 
    Please analyze the following code file and determine whether it belongs to any of the provided modules based on the listed module descriptions.
    Note that the provided list of modules may not be exhaustive, and some files may not belong to any of the modules. 
    If the code belongs to a module, Only output the module name, without any explanation or additional information; otherwise, return 'None' if it does not belong to any module.

    Modules : {
        "UI": "Handles the front-end user interface, consisting of HTML, CSS, and JavaScript files generated by the Angular framework. It processes user requests and interacts with the server using AJAX for data retrieval and client-side interactions."
"Test Driver": "Facilitates automated regression testing and handles transmission of test data in JSON format. It performs Java testing using TestNG and JavaScript unit-testing with Jest. It also sets up a simulated web server for servlet-level tests and automates end-to-end testing using Selenium Java."
"Logic": "Manages the business logic of TEAMMATES, including handling relationships between entities, managing transactions, input value sanitization, access control rights, and interfacing with GAE-provided or third-party APIs."
"Storage": "Performs CRUD operations on data entities, validation of data, and abstraction of GQL queries, hiding the complexities of datastore from the Logic component."
"Common": "Contains utility classes, custom exceptions, and data transfer objects used across the entire application for easy consolidation and transfer of structured data."
"E2E": "Handles end-to-end testing and load & performance testing, providing helpers, abstractions of browser pages, and test cases for E2E tests and L&P tests."
"Client": "Contains scripts for administrative tasks, such as migrating data to a new schema and calculating statistics. This module connects directly to the application back-end for administrative purposes."
    }

    Code: package teammates.ui.servlets; /** * Extracts trace ID of HTTP requests. */ public class RequestTraceFilter implements Filter { private static final Logger log = Logger.getLogger(); @Override public void init(FilterConfig filterConfig) { // nothing to do } @Override public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain) throws IOException, ServletException { HttpServletResponse response = (HttpServletResponse) resp; response.setHeader("Strict-Transport-Security", "max-age=31536000"); response.setHeader("Cache-Control", "no-store"); response.setHeader("Pragma", "no-cache"); HttpServletRequest request = (HttpServletRequest) req; String requestId = request.getHeader("X-Cloud-Trace-Context"); String traceId; String spanId = null; if (requestId == null) { // Generate random hexadecimal string of length 32 byte[] resBuf = new byte[16]; new Random().nextBytes(resBuf); traceId = Hex.encodeHexString(resBuf); } else { // X-Cloud-Trace-Context header is in form of TRACE_ID/SPAN_ID;o=TRACE_TRUE String[] traceAndSpan = requestId.split("/", 2); traceId = traceAndSpan[0]; if (traceAndSpan.length == 2) { spanId = traceAndSpan[1].split(";")[0]; } } // The header X-AppEngine-QueueName cannot be spoofed as GAE will strip any user-sent X-AppEngine-QueueName headers. // Reference: https://cloud.google.com/appengine/docs/standard/java/taskqueue/push/creating-handlers#reading_request_headers boolean isRequestFromAppEngineQueue = request.getHeader("X-AppEngine-QueueName") != null; // GAE will terminate an instance if any request exceeds 10 minutes. // For GAE-invoked requests, we set the limit here minus a small grace period of 5 seconds // to ensure that the 10 minutes limit will not be exceeded. // For user-invoked requests, we keep the time limit at 1 minute (as how it was // in the previous GAE runtime environment) in order to not let user wait for excessively long, // as well as a reminder for us to keep optimizing our API response time. int timeoutInSeconds = isRequestFromAppEngineQueue ? 10 * 60 - 5 : 60; RequestTracer.init(traceId, spanId, timeoutInSeconds); if (Config.MAINTENANCE) { throwError(request, response, HttpStatus.SC_SERVICE_UNAVAILABLE, "The server is currently undergoing some maintenance."); return; } try { // Make sure that all parameters are valid UTF-8 request.getParameterMap(); } catch (RuntimeException e) { if ("BadMessageException".equals(e.getClass().getSimpleName())) { throwError(request, response, HttpStatus.SC_BAD_REQUEST, e.getMessage()); return; } throw e; } chain.doFilter(req, resp); } @Override public void destroy() { // nothing to do } private void throwError(HttpServletRequest req, HttpServletResponse resp, int statusCode, String message) throws IOException { JsonResult result = new JsonResult(message, statusCode); result.send(resp); log.request(req, statusCode, message); } }
    
Assistant: