Spark CORS访问-控制-允许-来源错误

import javax.servlet.*;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

public class CorsFilter implements Filter {

    @Override
    public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {
        HttpServletResponse response = (HttpServletResponse) res;
        response.setHeader("Access-Control-Allow-Origin", "*"); // 允许所有来源
        response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE"); // 允许的HTTP方法
        response.setHeader("Access-Control-Max-Age", "3600"); // 预检请求缓存时间
        response.setHeader("Access-Control-Allow-Headers", "Content-Type, Authorization, X-Requested-With"); // 允许的请求头

        if ("OPTIONS".equalsIgnoreCase(((HttpServletRequest) req).getMethod())) {
            response.setStatus(HttpServletResponse.SC_OK);
        } else {
            chain.doFilter(req, res);
        }
    }

    @Override
    public void init(FilterConfig filterConfig) {}

    @Override
    public void destroy() {}
}

import static spark.Spark.*;

public class Main {
    public static void main(String[] args) {
        // ... 其他配置 ...

        after((req, res) -> {
            CorsFilter corsFilter = new CorsFilter();
            corsFilter.doFilter(req, res, null);
        });

        // ... 路由定义 ...
    }
}

import static spark.Spark.*;

public class Main {
    public static void main(String[] args) {
        // ... 其他配置 ...

        after((req, res) -> {
            res.header("Access-Control-Allow-Origin", "*");
            res.header("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE, OPTIONS");
            res.header("Access-Control-Allow-Headers", "Content-Type, Authorization");
        });

        // ... 路由定义 ...
    }
}