BackendService1.kt

// android/app/src/main/java/io/getstream/thestream/services/BackendService.kt:18
fun signIn(user: String) {
    authToken = post(
        "/v1/users",
        mapOf("user" to user)
    )
        .getString("authToken")
    this.user = user
}

// ...

private fun post(path: String, body: Map<String, Any>, authToken: String? = null): JSONObject {
    val request = Request.Builder()
        .url("$apiRoot${path}")
        .post(JSONObject(body).toString().toRequestBody(JSON))

    if (authToken != null) {
        request.addHeader("Authorization", "Bearer $authToken")
    }

    http.newCall(request.build()).execute().use {
        return JSONObject(it.body!!.string())
    }
}