#1 solutionFeature flags for Kotlin

import java.io.IOException
import okhttp3.MediaType.Companion.toMediaType
import okhttp3.OkHttpClient
import okhttp3.Request
import okhttp3.RequestBody.Companion.toRequestBody
 
val client = OkHttpClient()
 
val MEDIA_TYPE = "application/json".toMediaType()
 
val requestBody = "{\"userId\":\"foo\",\"email\":\"foo@gmail.com\"}"
 
val request = Request.Builder()
  .url("https://api.tggl.io/flags")
  .post(requestBody.toRequestBody(MEDIA_TYPE))
  .header("Content-Type", "application/json")
  .header("x-tggl-api-key", "API_KEY")
  .build()
 
client.newCall(request).execute().use { response ->
  if (!response.isSuccessful) throw IOException("Unexpected code $response")
  response.body!!.string()
}