add http tracing

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

@@ -2,6 +2,7 @@ package cn.quantgroup.tech.brave.configuration;
 
 import brave.Tracing;
 import brave.context.slf4j.MDCScopeDecorator;
+import brave.http.HttpTracing;
 import brave.propagation.B3Propagation;
 import brave.propagation.ExtraFieldPropagation;
 import brave.propagation.ThreadLocalCurrentTraceContext;
@@ -154,6 +155,12 @@ public class BraveAutoConfiguration {
                     .spanReporter(spanReporter()).build();
         }
 
+        @Bean
+        @ConditionalOnMissingBean
+        HttpTracing httpTracing(Tracing tracing) {
+            return HttpTracing.create(tracing);
+        }
+
         @Configuration
         @ConditionalOnClass({WebMvcConfigurer.class})
         @Import(SpanCustomizingAsyncHandlerInterceptor.class)