code: public static void clientBeforeSend(SofaRequest request) {
          if (openTrace) {
              try {
                  tracer.clientBeforeSend(request);
              } catch (Exception e) {
                  if (LOGGER.isWarnEnabled()) {
                      LOGGER.warn(e.getMessage(), e);
                  }
              }
          }
      }
docs: 1：客户端发送请求前
  
  @param request 调用请求