How to use feeder to parameterize a request body before posting it?

Gatling (Open-Source)
1

Hi,

I’m getting an issue while posting a Json with variables using feeder.

I have a text file AuthenticateBody.txt in the bodies folder:

{“type”:“user”,“user”:{“id”:2,“username”:"${Param_Username}",“password”:"${Param_Password}",“password2”:"${Param_Password}",“email”:"${Param_Username}",“language”:“EN”,“jurisdiction”:null,“url”:null}}

and a csv file in data folder named Param_WebUserCredentials_Grp1.dat:

Param_Username,Param_Password
xyz@xyz.com,password123
abc@abc.com,password123

I’m trying to post this text file and my script looks like this:

val Param_WebUserCredentials_Grp1=csv(“Param_WebUserCredentials_Grp1.dat”).circular

object LoginPage
{
val headers_1 = Map(
“Content-Type” → “application/json; charset=UTF-8”,
“Pragma” → “no-cache”,
“PreferredLangugae” → “EN”,
“Public” → “false”)

val headers_2 = Map(“PreferredLangugae” → “EN”)

val loginPage=exec(http(“authenticate”)
.post("/frontend/loginService/authenticate")
.pause(1)
.feed(Param_WebUserCredentials_Grp1)
.headers(headers_1)
.body(RawFileBody(“AuthenticateBody.txt”))
.check(/regex(""“userAccount”:"(.?)",""").find.saveAs(“Corr_UserAcc”),/
regex(""“token”:"(.?)",""").find.saveAs(“Corr_token”))
.check(substring(""“success”:true""").find.exists)//check for authentication
.resources(http(“homeCA.html”)
.get("/modules/home/views/homeCA.html")
.headers(headers_2)
.check(regex(""“Authorization: (.?)\n""").saveAs(“Corr_token”),
regex("""UserAccount: (.?)\n”"").saveAs(“Corr_UserAcc”)),
http(“fetchAuctionDetails”)
.post("/frontend/home/fetchAuctionDetails")
.headers(headers_1)
.body(RawFileBody(“FetchAuctionDetails.txt”)),
http(“privateHeader.html”)
.get("/modules/common/views/privateHeader.html")
.headers(headers_2),
http(“auctionPrivateHome.html”)
.get("/modules/home/views/auctionPrivateHome.html")
.headers(headers_2),
http(“auctionReports.html”)
.get("/modules/home/views/auctionReports.html")
.headers(headers_2),
http(“auctionPrivateInfo.html”)
.get("/modules/home/views/auctionPrivateInfo.html")
.headers(headers_2),
http(“privateFooter.html”)
.get("/modules/common/views/privateFooter.html")
.headers(headers_2),
http(“downloadAuctionReports.html”)
.get("/modules/common/views/downloadAuctionReports.html")
.headers(headers_2)))
.pause(3,5)
}

The problem is that the value of ${Param_Username} and ${Param_Password}" is not being fetched from the csv file and the body is fed as is. This is resulting in error. Can I know that how I can feed this text file such that the parameterized values are resolved before posting it.

Thanks !!!

2

Hi,

That’s the difference between “RawFileBody” and “ElFileBody”. The latter will resolve the gatling Expression Language in the file before sending it as body.

3

Thank you for the quick response. Your suggestion solved my issue. :slight_smile: