我正在尝试设置一个tomcat服务器来接收来自angular webapp的请求。在我开始尝试使用delete类型的请求之前，一切都正常。通过调试，我意识到问题出现在我的过滤器中，该过滤器检查用户在试图访问某些服务器资源时是否已经有会话，并拒绝这些请求。
代码如下：
后端会话筛选器：

public class SessionFilter extends HttpFilter {

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
    }

    @Override
    public void doFilter(HttpServletRequest request, HttpServletResponse response, FilterChain chain) throws IOException, ServletException {
        var out = response.getWriter();
        ObjectMapper mapper = new ObjectMapper();

        response.setContentType("application/json");
        if (request.getSession(false) == null && !request.getRequestURI().equals("/login")) {
            response.setStatus(401);
            out.println(mapper.writerFor(ServletResponse.class).writeValueAsString(new ServletResponse("User must be logged in first!")));
            return;
        }

        chain.doFilter(request, response);

    }

    @Override
    public void destroy() {
    }
}

登录servlet（提供会话的servlet）

@WebServlet(urlPatterns = "/login")
public class LoginServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        sess = req.getSession(true);
        sess.setMaxInactiveInterval(3600);
   }
}

执行删除请求的某个servlet

@WebServlet(urlPatterns = "/test")
public class TravelServlet extends HttpServlet {
    @Override
    protected void doDelete(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        PrintWriter out = resp.getWriter();
        out.println(req.getParameter("test"));
    }
}

web.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="https://jakarta.ee/xml/ns/jakartaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="https://jakarta.ee/xml/ns/jakartaee https://jakarta.ee/xml/ns/jakartaee/web-app_5_0.xsd"
         version="5.0">

    <filter>
        <filter-name>SessionFilter</filter-name>
        <filter-class>web.lab9.servlets.filters.SessionFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>SessionFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

    <filter>
        <filter-name>CorsFilter</filter-name>
        <filter-class>org.apache.catalina.filters.CorsFilter</filter-class>
        <init-param>
            <param-name>cors.allowed.origins</param-name>
            <param-value>http://localhost:4200</param-value>
        </init-param>
        <init-param>
            <param-name>cors.allowed.methods</param-name>
            <param-value>GET,POST,DELETE,HEAD,OPTIONS,PUT</param-value>
        </init-param>
        <init-param>
            <param-name>cors.allowed.headers</param-name>
            <param-value>Content-Type,X-Requested-With,accept,Origin,Access-Control-Request-Method,Access-Control-Request-Headers</param-value>
        </init-param>
        <init-param>
            <param-name>cors.exposed.headers</param-name>
            <param-value>Access-Control-Allow-Origin,Access-Control-Allow-Credentials</param-value>
        </init-param>
        <init-param>
            <param-name>cors.support.credentials</param-name>
            <param-value>true</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>CorsFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
</web-app>

现在在前端，使用angular，我这样称呼请求：

this.http.delete<string>(this.url, {
      params: new HttpParams().set('test', 'test'),
      withCredentials: true
    }).subscribe(result => {console.log(result);}, error => {console.log(error);});

每当删除请求到达服务器时，会话都为null，并且我从会话筛选器中抛出一个错误。据我所知，这是因为飞行前的请求以及飞行前没有设置头的事实。我有什么办法可以绕过这件事吗？除了http servlet和过滤器之外，我不允许使用任何东西。
另外，我可以从会话筛选器中执行重定向操作吗？在使用delete请求之前，我能够做到这一点，但自从我开始使用它以来，我只遇到了一些问题，因为处理get/post请求的方法在处理delete/put/时根本不起作用。。。