Issue with two http confs in Gatling

gistfile1.scala

package basic
import com.excilys.ebi.gatling.core.Predef._
import com.excilys.ebi.gatling.http.Predef._
 
class BasicExampleSimulation extends Simulation {
 
        def apply = {
 
                val urlBase = "http://excilys-bank-web.cloudfoundry.com"
                val urlBase2 = "https://excilys-bank-web.cloudfoundry.com"
 
                val httpConf = httpConfig.baseURL(urlBase)
                val httpConf2 = httpConfig.baseURL(urlBase2)
 
                val headers_1 = Map(
                        "Accept" -> "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8",
                        "Accept-Charset" -> "ISO-8859-1,utf-8;q=0.7,*;q=0.7",
                        "Accept-Encoding" -> "gzip,deflate",
                        "Accept-Language" -> "fr,en-us;q=0.7,en;q=0.3",
                        "Host" -> "excilys-bank-web.cloudfoundry.com",
                        "Keep-Alive" -> "115",
                        "User-Agent" -> "Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.2.17) Gecko/20110422 Ubuntu/9.10 (karmic) Firefox/3.6.17")
 
             
                val scn = scenario("Scenario name")
                        .exec(
                                http("request_1")
                                        .get("/")
                                        .headers(headers_1)
                                        .check(status.is(302)))
                        .pause(0, 100, MILLISECONDS)
                        .exec(
                                http("request_2")
                                        .get("/public/login.html")
                                        .headers(headers_1))
 
                List(scn.configure.users(10).ramp(10).protocolConfig(httpConf, httpConf2))
        }
}