MyViewModel.kt

suspend fun getPasskeyAuthenticationRequestJson(username: String): String = withContext(
    Dispatchers.IO) {
    val url = HttpUrl.Builder()
        .scheme("https")
        .host("auth.tomcolvin.co.uk")
        .addPathSegment("generate-authentication-options")
        .addQueryParameter("username", username)
        .build()
    val request = Request.Builder()
        .url(url)
        .build()

    val response = okHttpClient.newCall(request).execute()
    response.body?.string() ?: throw Exception("No response body")
}