code: protected void beforeSend(RpcInternalContext context, SofaRequest request) {
          currentRequests.incrementAndGet();
          context.getStopWatch().tick().read();
          context.setLocalAddress(localAddress());
          if (EventBus.isEnable(ClientBeforeSendEvent.class)) {
              EventBus.post(new ClientBeforeSendEvent(request));
          }
      }
docs: 调用前设置一些属性
  
  @param context RPC上下文
  @param request 请求对象