使用 Apache SkyWalking 进行 Spring Cloud 应用的分布式追踪与监控：完整教程

@Configuration
public class SkyWalkingConfig {
 
    @Bean
    public ServletRegistrationBean<Servlet> servletRegistrationBean() {
        return new ServletRegistrationBean<>(new Servlet() {
            @Override
            public void service(ServletRequest req, ServletResponse res) throws ServletException, IOException {
                HttpServletRequest request = (HttpServletRequest) req;
                HttpServletResponse response = (HttpServletResponse) res;
                String agentOSS = request.getHeader("User-Agent");
                if (agentOSS != null && agentOSS.toLowerCase().contains("apache skyapm")) {
                    response.setStatus(HttpServletResponse.SC_OK);
                } else {
                    response.setStatus(HttpServletResponse.SC_NOT_FOUND);
                }
            }
        }, "/v1/trace");
    }
}

这段代码定义了一个名为SkyWalkingConfig的配置类，并在其中创建了一个Servlet注册Bean。这个Servlet处理SkyWalking代理发送的追踪数据，验证请求头并相应正确的HTTP状态码。这样可以确保只有SkyWalking代理可以与服务通信，增加系统的安全性。