自定义DelegatingTracingFilter，当http method为options时，直接执行chain.doFilter(request, response)。

brave-spring-boot-starter/src/main/java/cn/quantgroup/tech/brave/configuration/BraveAutoConfiguration.java

@@ -7,8 +7,8 @@ import brave.okhttp3.TracingInterceptor;
 import brave.propagation.B3Propagation;
 import brave.propagation.ExtraFieldPropagation;
 import brave.spring.web.TracingClientHttpRequestInterceptor;
-import brave.spring.webmvc.DelegatingTracingFilter;
 import brave.spring.webmvc.SpanCustomizingAsyncHandlerInterceptor;
+import cn.quantgroup.tech.brave.filter.CustomDelegatingTracingFilter;
 import cn.quantgroup.tech.brave.properties.BraveProperties;
 import cn.quantgroup.tech.brave.properties.ServiceProperties;
 import cn.quantgroup.tech.brave.service.ITechHttpClient;
@@ -245,7 +245,7 @@ public class BraveAutoConfiguration {
             @Bean
             public FilterRegistrationBean registrationBean() {
                 FilterRegistrationBean registrationBean = new FilterRegistrationBean();
-                DelegatingTracingFilter delegatingTracingFilter = new DelegatingTracingFilter();
+                CustomDelegatingTracingFilter delegatingTracingFilter = new CustomDelegatingTracingFilter();
                 registrationBean.setFilter(delegatingTracingFilter);
                 registrationBean.setName("techDelegatingTracingFilter");
                 registrationBean.setOrder(Integer.MIN_VALUE);

brave-spring-boot-starter/src/main/java/cn/quantgroup/tech/brave/filter/CustomDelegatingTracingFilter.java

+package cn.quantgroup.tech.brave.filter;
+
+import brave.servlet.TracingFilter;
+import brave.spring.webmvc.DelegatingTracingFilter;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.http.HttpMethod;
+
+import javax.servlet.*;
+import javax.servlet.http.HttpServletRequest;
+import java.io.IOException;
+
+/**
+ * Similar to {@link TracingFilter}, except that it initializes from Spring.
+ *
+ * <p> {@link org.springframework.web.filter.DelegatingFilterProxy} is similar, but it uses
+ * volatile references as it allows lazy initialization from doGet. This filter cannot do that
+ * anyway because {@code ServletRequest.getServletContext()} was added after servlet 2.5!
+ */
+@Slf4j
+public final class CustomDelegatingTracingFilter implements Filter {
+
+    // servlet ensures create is directly followed by init, so no need for volatile
+    DelegatingTracingFilter delegatingTracingFilter;
+
+    @Override
+    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
+            throws IOException, ServletException {
+        HttpServletRequest httpServletRequest = (HttpServletRequest) request;
+
+        // don't break on initialization error.
+        if (HttpMethod.OPTIONS.name().equals(httpServletRequest.getMethod()) || delegatingTracingFilter == null) {
+            chain.doFilter(request, response);
+        } else {
+            delegatingTracingFilter.doFilter(request, response, chain);
+        }
+    }
+
+    @Override
+    public void init(FilterConfig filterConfig) {
+        DelegatingTracingFilter delegatingTracingFilter = new DelegatingTracingFilter();
+        delegatingTracingFilter.init(filterConfig);
+        this.delegatingTracingFilter = delegatingTracingFilter;
+    }
+
+    @Override
+    public void destroy() {
+        // TracingFilter is stateless, so nothing to destroy
+    }
+}