code: public static void pickupFromRequest(RpcInvokeContext context, SofaRequest request, boolean init) {
          if (context == null && !init) {
              return;
          }
          // 解析请求 
          Map<String, String> requestBaggage = (Map<String, String>) request
              .getRequestProp(RemotingConstants.RPC_REQUEST_BAGGAGE);
          if (CommonUtils.isNotEmpty(requestBaggage)) {
              if (context == null) {
                  context = RpcInvokeContext.getContext();
              }
              context.putAllRequestBaggage(requestBaggage);
          }
      }
docs: 从请求里获取透传数据
  
  @param context RpcInvokeContext
  @param request 请求
  @param init    传入上下文为空时，是否初始化