text: 
  const traceId = Symbol("_traceId");
  module.exports = {
  
    get traceId() {
      //如果有traceId 则根据traceId继续链路
      if (this.header["x-request-id"]) {
        this[traceId] = Buffer.from(this.header["x-request-id"], "hex").slice(
          0,
          8
        );
      }
      return this[traceId];
    },
    set traceId(_traceId) {
      this[traceId] = _traceId;
    },
    get requestId() {
      return this[traceId].toString("hex");
    },
  }
  