fun nonAsciiResponseHeader(protocol: Protocol) {
    setUp(protocol)
    server.enqueue(
      MockResponse
        .Builder()
        .addHeaderLenient("Alpha", "α")
        .addHeaderLenient("β", "Beta")
        .build(),
    )
    val call = client.newCall(Request(server.url("/")))
    val response = call.execute()
    response.close()