apm-sniffer/apm-sdk-plugin/feign-default-http-9.x-plugin/src/main/java/org/apache/skywalking/apm/plugin/feign/http/v9/LoadBalancerHttpClientInterceptor.java [77:93]:
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    public Object afterMethod(EnhancedInstance objInst, Method method, Object[] allArguments, Class<?>[] argumentsTypes,
                              Object ret) {
        Response response = (Response) ret;
        if (response != null) {
            int statusCode = response.status();

            AbstractSpan span = ContextManager.activeSpan();
            Tags.HTTP_RESPONSE_STATUS_CODE.set(span, statusCode);
            if (statusCode >= 400) {
                span.errorOccurred();
            }
        }

        ContextManager.stopSpan();

        return ret;
    }
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apm-sniffer/apm-sdk-plugin/feign-default-http-9.x-plugin/src/main/java/org/apache/skywalking/apm/plugin/feign/http/v9/DefaultHttpClientInterceptor.java [150:166]:
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    public Object afterMethod(EnhancedInstance objInst, Method method, Object[] allArguments, Class<?>[] argumentsTypes,
                              Object ret) {
        Response response = (Response) ret;
        if (response != null) {
            int statusCode = response.status();

            AbstractSpan span = ContextManager.activeSpan();
            Tags.HTTP_RESPONSE_STATUS_CODE.set(span, statusCode);
            if (statusCode >= 400) {
                span.errorOccurred();
            }
        }

        ContextManager.stopSpan();

        return ret;
    }
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