Gatling-Value baseURL is not a member of io.gatling.http.protocol.HttpProtocolBuilder

Question

I've written the following Gatling scenario below. I'm getting the following error

Value baseURL is not a member of io.gatling.http.protocol.HttpProtocolBuilder

I tried directly importing the io.gatling.http.protocol.HttpProtocolBuilder but that did not solve the problem. Can anyone identify the root cause in my code below?

Also, I would like this scenario to ramp up to 1 million requests over 4 hours with 2000 users. Does the injection below successfully perform that load?

 import io.gatling.core.Predef._
 import io.gatling.http.Predef._
 import scala.concurrent.duration._

 class Kafka extends Simulation{
      val httpProtocol = http.baseURL("https://apex-my-url-is.in.these.quotes.com");

      val kafkaScenario = scenario("KafkaPerfTest")
      .exec(http("Kafka Request").post("/method/method")
                            .header("Content-Type", "application/json")
                            .body(StringBody(""" 
                              {
                                "logDatetime": "2019-03-18T20:26:38.940Z",
                                "url": "/test",
                                "apiName": "test",
                                "apiVersion": "test",
                                "method": "GET",
                                "status": 200,
                                "vin": "TESTTESTVIN0001",
                                "accessToken": "test",
                                "user": "test",
                                "queryParams": "",
                                "requestHeader": "test",
                                "requestBody": "test",
                                "responseHeader": "test",
                                "responseBody": "test",
                                "responseTime": 200,
                                "traceId": "test",
                                "serviceName": "test",
                                "type": "INBOUND"
                              } 
                              """))
                              .check(status.is(202)));
  setUp(kafkaScenario.inject(
    constantConcurrentUsers(2000) during(4 hours))
    .protocols(httpProtocol)
    .throttle(jumpToRps(500),holdFor(4 hours)));
  }

Guessrope

Answer 1

Try "http.baseUrl" instead of "http.baseURL"

Leclerc

That worked! Is my setUp correct to ramp up to 1 million requests over 4 hours with 2000 users? – Guessrope

With this setup you will inject 28 millions users in 4 hours, but because of throttle only part of them will be able to execute requests, rest will stuck-up in queue, I do not remember if waiting users are opening connections but you may run out of open sockets or reach connections limit this way. I would recommend to start with lower number of users and shorter test and find out what is a best value for you. – Bicameral

Thanks Mateusz. We are looking to see how this service performs with an extremely high number of requests. We aren't concerned really with the number of users. That's why I used 'throtte'. Would you recommend constantUsersPerSec? – Guessrope

It looks like baseURL was renamed baseUrl in the gatling libraries at some point (maybe v3). So the case that works will depend on which version of gatling you are using. – Coquito