apm-sniffer/apm-sdk-plugin/tomcat-10x-plugin/src/main/java/org/apache/skywalking/apm/plugin/tomcat10x/TomcatInvokeInterceptor.java [49:69]:
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    public void beforeMethod(EnhancedInstance objInst, Method method, Object[] allArguments, Class<?>[] argumentsTypes,
                             MethodInterceptResult result) throws Throwable {
        Request request = (Request) allArguments[0];
        ContextCarrier contextCarrier = new ContextCarrier();

        CarrierItem next = contextCarrier.items();
        while (next.hasNext()) {
            next = next.next();
            next.setHeadValue(request.getHeader(next.getHeadKey()));
        }
        String operationName =  String.join(":", request.getMethod(), request.getRequestURI());
        AbstractSpan span = ContextManager.createEntrySpan(operationName, contextCarrier);
        Tags.URL.set(span, request.getRequestURL().toString());
        Tags.HTTP.METHOD.set(span, request.getMethod());
        span.setComponent(ComponentsDefine.TOMCAT);
        SpanLayer.asHttp(span);

        if (TomcatPluginConfig.Plugin.Tomcat.COLLECT_HTTP_PARAMS) {
            collectHttpParam(request, span);
        }
    }
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apm-sniffer/apm-sdk-plugin/tomcat-7.x-8.x-plugin/src/main/java/org/apache/skywalking/apm/plugin/tomcat78x/TomcatInvokeInterceptor.java [67:87]:
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    public void beforeMethod(EnhancedInstance objInst, Method method, Object[] allArguments, Class<?>[] argumentsTypes,
                             MethodInterceptResult result) throws Throwable {
        Request request = (Request) allArguments[0];
        ContextCarrier contextCarrier = new ContextCarrier();

        CarrierItem next = contextCarrier.items();
        while (next.hasNext()) {
            next = next.next();
            next.setHeadValue(request.getHeader(next.getHeadKey()));
        }
        String operationName =  String.join(":", request.getMethod(), request.getRequestURI());
        AbstractSpan span = ContextManager.createEntrySpan(operationName, contextCarrier);
        Tags.URL.set(span, request.getRequestURL().toString());
        Tags.HTTP.METHOD.set(span, request.getMethod());
        span.setComponent(ComponentsDefine.TOMCAT);
        SpanLayer.asHttp(span);

        if (TomcatPluginConfig.Plugin.Tomcat.COLLECT_HTTP_PARAMS) {
            collectHttpParam(request, span);
        }
    }
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