Setting cookie properly in fuel requests

Question

I'm trying to set cookie to all get or post request after successful authentication. The authentication request returns response with Set-cookie header value of format

[accesstoken=sample_token; Version=1; Comment=secured; Domain=test.com; Max-Age=172800000; Expires=Mon, 07-Apr-2025 10:55:18 GMT; Path=]

For web application I don't have to set anything, the xhr request automatically handles appending cookie. This cookie is also responsible for identifying user on back-end. I've read somewhere that cookie is just header with Cookie as key value.So after successful authentication, the Set-Cookie header is being read from response header of the format given using

var cookeis = response.headers.get("Set-Cookie").toString()

Next this value is appended as header in each subsequent requests.

fun _POST(ctx: Context, path: String, query: List<Pair<String, String?>>): Request {
  var fuel = Fuel.post(ctx.getString(baseID)+path, query)
  val accesstoken = getCookie(ctx)

  when(accesstoken!=null){
    true ->  fuel = fuel.set(com.github.kittinunf.fuel.core.Headers.COOKIE,accesstoken)
    false -> {}
  }
return fuel
}

I can see the header being sent if I print headers in any post request as given below

val (request, response, result) = _POST(this@MainActivity, getString(R.string.API_MY_DATA), listOf("date" to currentDate))
                .also { println(it.headers.toString()) }
                .response()

this will print the same cookie previously set -

[accesstoken=sample_token; Version=1; Comment=secured; Domain=test.com; Max-Age=172800000; Expires=Mon, 07-Apr-2025 10:55:18 GMT; Path=]

but the server returns 400 response status. The same api was also used to develop an app using react-native library. There, xhr requests automatically handles cookie management.

NB: I don't have access to back-end.

Answer 1

I got this code to work for sending a single incoming cookie:

// response being from a previous Fuel POST
val cook = response.headers["Set-Cookie"].first()

Fuel.get("https://mundraub.org/node/add/plant").header(Headers.COOKIE to cook)
.responseString { request2, response2, result2 ->  ...  }