private void recordCookie(Request request, Trace trace) {
    for (String cookie : request.headers("Cookie")) {
      if (cookieSampler.isSampling()) {
        final SpanEventRecorder recorder = trace.currentSpanEventRecorder();
        recorder.recordAttribute(AnnotationKey.HTTP_COOKIE, StringUtils.drop(cookie, 1024));
      }

      return;
    }
  }
  @Override
  public void after(Object target, Object[] args, Object result, Throwable throwable) {
    if (isDebug) {
      logger.afterInterceptor(target, args);
    }

    final Trace trace = traceContext.currentRawTraceObject();
    if (trace == null) {
      return;
    }

    // check user include trace.
    if (!isUserIncludeTrace(trace)) {
      return;
    }

    // leave scope(default & disable trace).
    if (!leaveUserIncludeTraceScope(trace)) {
      logger.warn(
          "Failed to leave scope of user include trace. trace={}, sampled={}",
          trace,
          trace.canSampled());
      // delete unstable trace.
      deleteUserIncludeTrace(trace);
      return;
    }

    // check sampled.
    if (!trace.canSampled()) {
      if (isUserIncludeTraceDestination(trace)) {
        deleteUserIncludeTrace(trace);
      }
      return;
    }

    try {
      final SpanEventRecorder recorder = trace.currentSpanEventRecorder();
      recorder.recordApi(descriptor);
      recorder.recordServiceType(ServiceType.INTERNAL_METHOD);
      recorder.recordException(throwable);
    } finally {
      trace.traceBlockEnd();
      if (isUserIncludeTraceDestination(trace)) {
        deleteUserIncludeTrace(trace);
      }
    }
  }
  @Override
  public void before(Object target, Object[] args) {
    if (isDebug) {
      logger.beforeInterceptor(target, args);
    }

    final Trace trace = traceContext.currentRawTraceObject();
    if (trace == null) {
      return;
    }

    if (!validate(target)) {
      return;
    }

    if (!trace.canSampled()) {
      return;
    }

    SpanEventRecorder recorder = trace.traceBlockBegin();
    try {
      final TraceId nextId = trace.getTraceId().getNextTraceId();
      recorder.recordNextSpanId(nextId.getSpanId());
      recorder.recordServiceType(OK_HTTP_CLIENT);

      InterceptorGroupInvocation invocation = interceptorGroup.getCurrentInvocation();
      if (invocation != null) {
        invocation.getOrCreateAttachment(
            new AttachmentFactory() {
              @Override
              public Object createAttachment() {
                return nextId;
              }
            });
      }
    } catch (Throwable t) {
      logger.warn("Failed to BEFORE process. {}", t.getMessage(), t);
    }
  }
  @Override
  public void after(Object target, Object[] args, Object result, Throwable throwable) {
    if (isDebug) {
      logger.afterInterceptor(target, args);
    }

    final Trace trace = traceContext.currentTraceObject();
    if (trace == null) {
      return;
    }

    if (!validate(target)) {
      return;
    }

    try {
      SpanEventRecorder recorder = trace.currentSpanEventRecorder();
      recorder.recordApi(methodDescriptor);
      recorder.recordException(throwable);

      Request request = ((UserRequestGetter) target)._$PINPOINT$_getUserRequest();
      if (request != null) {
        recorder.recordAttribute(AnnotationKey.HTTP_URL, request.httpUrl().toString());
        recorder.recordDestinationId(request.httpUrl().host() + ":" + request.httpUrl().port());
        recordRequest(trace, request, throwable);
      }

      // clear attachment.
      InterceptorGroupInvocation invocation = interceptorGroup.getCurrentInvocation();
      if (invocation != null && invocation.getAttachment() != null) {
        invocation.removeAttachment();
      }
    } finally {
      trace.traceBlockEnd();
    }
  }