如何在gatling中获取虚拟用户id/详细信息？

import io.gatling.core.Predef._
import io.gatling.http.Predef._

class MySimulation extends Simulation {
  
  val httpConf = http.baseUrl("http://example.com")
  
  val scn = scenario("My Scenario")
    .exec(http("My Request")
      .get("/my-endpoint")
      .check(status.is(200))
    )
    .exec(session => {
      val userId = session.userId // 获取虚拟用户ID
      println(s"User ID: $userId")
      session // 返回会话对象，保持会话的连续性
    })
  
  setUp(
    scn.inject(atOnceUsers(10))
  ).protocols(httpConf)
}