val proxy = authHeader.startsWith("Proxy-")
    val responseCode = if (proxy) 407 else 401
    val authenticator = RecordingAuthenticator(null)
    java.net.Authenticator.setDefault(authenticator)
    server.enqueue(
      MockResponse
        .Builder()
        .code(responseCode)
        .addHeader(authHeader)
        .body("Please authenticate.")
        .build(),