code: public static void serverSend(SofaRequest request, SofaResponse response, Throwable throwable) {
          if (openTrace) {
              try {
                  tracer.serverSend(request, response, throwable);
              } catch (Exception e) {
                  if (LOGGER.isWarnEnabled()) {
                      LOGGER.warn(e.getMessage(), e);
                  }
              }
          }
      }
docs: 3. 服务端返回请求或者异常
  
  @param request   调用请求
  @param response  调用响应
  @param throwable 异常